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    The purpose of  this blog is the creation of an open, international, independent and  free forum, where every UFO-researcher can publish the results of his/her research. The languagues, used for this blog, are Dutch, English and French.You can find the articles of a collegue by selecting his category.
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    Een interessant adres?
    UFO'S of UAP'S, ASTRONOMIE, RUIMTEVAART, ARCHEOLOGIE, OUDHEIDKUNDE, SF-SNUFJES EN ANDERE ESOTERISCHE WETENSCHAPPEN - DE ALLERLAATSTE NIEUWTJES
    UFO's of UAP'S in België en de rest van de wereld
    Ontdek de Fascinerende Wereld van UFO's en UAP's: Jouw Bron voor Onthullende Informatie! Ben jij ook gefascineerd door het onbekende? Wil je meer weten over UFO's en UAP's, niet alleen in België, maar over de hele wereld? Dan ben je op de juiste plek! België: Het Kloppend Hart van UFO-onderzoek In België is BUFON (Belgisch UFO-Netwerk) dé autoriteit op het gebied van UFO-onderzoek. Voor betrouwbare en objectieve informatie over deze intrigerende fenomenen, bezoek je zeker onze Facebook-pagina en deze blog. Maar dat is nog niet alles! Ontdek ook het Belgisch UFO-meldpunt en Caelestia, twee organisaties die diepgaand onderzoek verrichten, al zijn ze soms kritisch of sceptisch. Nederland: Een Schat aan Informatie Voor onze Nederlandse buren is er de schitterende website www.ufowijzer.nl, beheerd door Paul Harmans. Deze site biedt een schat aan informatie en artikelen die je niet wilt missen! Internationaal: MUFON - De Wereldwijde Autoriteit Neem ook een kijkje bij MUFON (Mutual UFO Network Inc.), een gerenommeerde Amerikaanse UFO-vereniging met afdelingen in de VS en wereldwijd. MUFON is toegewijd aan de wetenschappelijke en analytische studie van het UFO-fenomeen, en hun maandelijkse tijdschrift, The MUFON UFO-Journal, is een must-read voor elke UFO-enthousiasteling. Bezoek hun website op www.mufon.com voor meer informatie. Samenwerking en Toekomstvisie Sinds 1 februari 2020 is Pieter niet alleen ex-president van BUFON, maar ook de voormalige nationale directeur van MUFON in Vlaanderen en Nederland. Dit creëert een sterke samenwerking met de Franse MUFON Reseau MUFON/EUROP, wat ons in staat stelt om nog meer waardevolle inzichten te delen. Let op: Nepprofielen en Nieuwe Groeperingen Pas op voor een nieuwe groepering die zich ook BUFON noemt, maar geen enkele connectie heeft met onze gevestigde organisatie. Hoewel zij de naam geregistreerd hebben, kunnen ze het rijke verleden en de expertise van onze groep niet evenaren. We wensen hen veel succes, maar we blijven de autoriteit in UFO-onderzoek! Blijf Op De Hoogte! Wil jij de laatste nieuwtjes over UFO's, ruimtevaart, archeologie, en meer? Volg ons dan en duik samen met ons in de fascinerende wereld van het onbekende! Sluit je aan bij de gemeenschap van nieuwsgierige geesten die net als jij verlangen naar antwoorden en avonturen in de sterren! Heb je vragen of wil je meer weten? Aarzel dan niet om contact met ons op te nemen! Samen ontrafelen we het mysterie van de lucht en daarbuiten.
    27-02-2020
    Klik hier om een link te hebben waarmee u dit artikel later terug kunt lezen.Blood Red Snow Covers Antarctic Outpost

    Blood Red Snow Covers Antarctic Outpost

    The year 2020 has not started off well for the continent of Antarctica. In early February, the highest temperature in recorded history was reached 64.9 degrees Fahrenheit (18.3 degrees Celsius). A few days later, an iceberg the size of the U.S. city of Atlanta broke off of the Pine Island Glacier – one of the most watched chunks of ice on the planet because it has been calving frequently and these plus future icebergs are raising the ocean level. If that weren’t enough, this week the Ukrainian Antarctic station “Academician Vernadsky” was hit by the classic Fortean phenomena of blood red snow. Are these signs? Should we be worried? Who do we believe?

    “For a few weeks, the Ukrainian Antarctic station “Academician Vernadsky” has been otočena… raspberry snow!” (Google translation)

    The Ministry of Education and Science of Ukraine posted pictures and information about the red snow on its Facebook page on February 24. (Other pictures here.) To prevent any panic or misinterpretation of the “raspberry” snow and ice, the Ministry gave the biological explanation for the phenomena.

    “Our scientists have identified them under a microscope as Chlamydomonas nivalis chlamydomonas.”

    “Because, besides green pigment – chlorophyll, their cells contain also a red carotene layer, red spots occur on snow as if from raspberry jam. By the way, this layer protects algae from ultraviolet radiation.”

    Chlamydomonas nivalis chlamydomonas

    Yes, red snow is a good thing … at least for the algae giving it that color. Summer is nearing an end in Antarctica, so the algae needs all the red color it can generate to protect itself. That’s especially true this summer with the record high temperatures. Climate change?

    “”Blossom” of snow contributes to climate change. Because of red-raspberry coloring, snow less hitting sunlight and melts faster. As a result, it forms more bright seaweed.”

    It’s both a cause and effect of climate change. If anyone would know this, it’s the scientists at Vernadsky Research Base, the only Ukrainian Antarctic station, whose mission is research geophysics, meteorology, and ionospherics using meteorology, upper atmospheric physics and studies of geomagnetism, ozone, seismology, glaciology and more. The 12-person base was opened by the UK in 1947 as Faraday Station and is a center for long-term temperature studies. According to a 2013 report on daily observed temperatures from 1947 to 2011, we’ve got bigger problems than raspberry snow.

    “Faraday/Vernadsky is experiencing a significant warming trend of about 0.6°C/decade (1.1°F) over the last few decades. Concurrently, the magnitude of extremely cold temperatures has reduced.”

    So yes, the red snow is biological, not Fortean, and it’s a sign.

    Is anyone watching?

    https://mysteriousuniverse.org/ }

    27-02-2020 om 22:59 geschreven door peter  

    0 1 2 3 4 5 - Gemiddelde waardering: 0/5 - (0 Stemmen)
    Categorie:Diversen (Eng, NL en Fr)
    Klik hier om een link te hebben waarmee u dit artikel later terug kunt lezen.Unique Non-Oxygen Breathing Animal Discovered

    Unique Non-Oxygen Breathing Animal Discovered

    Researchers at Tel Aviv University (TAU) have discovered a non-oxygen breathing animal. The unexpected finding changes one of science’s assumptions about the animal world.

    A study on the finding was published on February 25 in PNAS by TAU researchers led by Prof. Dorothee Huchon of the School of Zoology at TAU’s Faculty of Life Sciences and Steinhardt Museum of Natural History.

    TEM image of H. salminicola mitochondrion-related organelle with few cristae.
    Credit: TAU

    The tiny, less than 10-celled parasite Henneguya salminicola lives in salmon muscle. As it evolved, the animal, which is a myxozoan relative of jellyfish and corals, gave up breathing and consuming oxygen to produce energy.

    “Aerobic respiration was thought to be ubiquitous in animals, but now we confirmed that this is not the case,” Prof. Huchon explains. “Our discovery shows that evolution can go in strange directions. Aerobic respiration is a major source of energy, and yet we found an animal that gave up this critical pathway.”

    Some other organisms like fungi, amoebas or ciliate lineages in anaerobic environments have lost the ability to breathe over time. The new study demonstrates that the same can happen to an animal — possibly because the parasite happens to live in an anaerobic environment.

    Its genome was sequenced, along with those of other myxozoan fish parasites, as part of research supported by the U.S.-Israel Binational Science Foundation and conducted with Prof. Paulyn Cartwright of the University of Kansas, and Prof. Jerri Bartholomew and Dr. Stephen Atkinson of Oregon State University.

    The parasite’s anaerobic nature was an accidental discovery. While assembling the Henneguya genome, Prof. Huchon found that it did not include a mitochondrial genome. The mitochondria is the powerhouse of the cell where oxygen is captured to make energy, so its absence indicated that the animal was not breathing oxygen.

    Until the new discovery, there was debate regarding the possibility that organisms belonging to the animal kingdom could survive in anaerobic environments. The assumption that all animals are breathing oxygen was based, among other things, on the fact that animals are multicellular, highly developed organisms, which first appeared on Earth when oxygen levels rose.

    “It’s not yet clear to us how the parasite generates energy,” Prof. Huchon says. “It may be drawing it from the surrounding fish cells, or it may have a different type of respiration such as oxygen-free breathing, which typically characterizes anaerobic non-animal organisms.”

    According to Prof. Huchon, the discovery bears enormous significance for evolutionary research.

    “It is generally thought that during evolution, organisms become more and more complex, and that simple single-celled or few-celled organisms are the ancestors of complex organisms,” she concludes. “But here, right before us, is an animal whose evolutionary process is the opposite. Living in an oxygen-free environment, it has shed unnecessary genes responsible for aerobic respiration and become an even simpler organism.”

    • See the publication at the PNAS web site here.

    Contacts and sources:

    • American Friends of Tel Aviv University
      Tel Aviv University

    Publication:

    • A cnidarian parasite of salmon (Myxozoa: Henneguya) lacks a mitochondrial genome Dayana Yahalomi, Stephen D. Atkinson, Moran Neuhof, E. Sally Chang, Hervé Philippe, Paulyn Cartwright, Jerri L. Bartholomew, Dorothée Huchon.. Proceedings of the National Academy of Sciences, 2020; 201909907 DOI: 10.1073/pnas.1909907117

    Source: 

    https://beforeitsnews.com/ }

    27-02-2020 om 21:24 geschreven door peter  

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    Categorie:Diversen (Eng, NL en Fr)
    20-02-2020
    Klik hier om een link te hebben waarmee u dit artikel later terug kunt lezen.A bee from the age of dinosaurs

    A bee from the age of dinosaurs

    One hundred million years ago, a bee got trapped in tree resin. Over time, geological forces converted the resin to amber. Now a scientist arrives on the scene, to tell us this bee’s story.

    Left view of the fossil bee in amber.

    Primitive bee trapped in amber. It lived in a tropical jungle 100 million years ago, when flowering plants were just beginning to diversify. It’s thought that bees and flowering plants co-evolved. This specimen has traits from modern bees and their evolutionary ancestors, the carnivorous apoid wasps.

    Image via George Poinar Jr./ OSU.

    About 100 million years ago, a female bee with young beetle larvae crawling all over her body flew haplessly into a glob of sticky tree resin where she became trapped. Over time, the resin fossilized to become amber, preserving the bee and its parasites in exquisite detail within the clear honey-colored rock. As rare as it is, this fossil bee isn’t the first to be found entombed in amber. But it is the only known known amber-encased bee that has pollen on it. And it’s the only fossil bee with parasites, providing a fascinating glimpse into a predator-prey relationship that continues to this day. And the entomologist who studied this doomed bee? He iGeorge Poinar Jr. of Oregon State University (OSU), whose work helped inspire the movie “Jurassic Park.”

    Poinar’s work also showed that the bee – which he named Discoscapa apicula – belonged to a new family, genus, and species. His findings were published in the January 29, 2020, issue of BioOne Complete.

    George Poinar, Jr. is a renowned expert in animals and plants fossilized in amber. He’s also credited with popularizing the idea of extracting DNA from these primitive insects. This idea received widespread attention when Michael Crichton incorporated it into his blockbuster Jurassic Park franchise. In the movie, dinosaur blood is extracted from mosquitoes encased in amber from the age of dinosaurs, and DNA in the blood is used to clone living dinosaurs.

    In the real world of science, researchers study insect pollinators, such as bees, because they’re critically important to the reproduction of flowering plants, some of which are key to humans’ food supply.

    There are more than 16,000 known bee species worldwide, from seven taxonomic families. Bees feed primarily on nectar and pollen, in contrast to their evolutionary ancestors, apoid wasps, that preyed on other insects.

    Closeup of fossilized bee in amber, with four larval beetle parasites.

    A new species of bee, trapped in amber for about 100 million years. Can you spot the parasitic beetle larvae it carried?

    Image via George Poinar Jr./ OSU.

    The newly studied bee fossil, from Myanmar, dates to the mid-Cretaceous period. This bee’s world was a tropical forest of mostly conifers, ferns, cycads, ginkgo, and horsetails. Angiosperms – flowering plants – were just beginning to diversify, along with the primitive bees that pollinated their flowers. These ancient bees shared traits seen in both modern bees and their evolutionary forebearers, apoid wasps.

    In a statement about this new research, Poinar commented on one of the most interesting features of the bee:

    Something unique about the new family that’s not found on any extant or extinct lineage of apoid wasps or bees is a bifurcated scape.

    The scape is a base section of the antenna, closest to the bee’s head. In this bee, it branches into two sections, one ending as a small spur. This feature has never before been seen in either living or fossil bees.

    Microscope view of a segment of the bee's antenna, with labels.

    An image of the “scape” on one of the bee’s antennae, divided into 2 parts. This bifurcated scape has not seen before, in any known fossil or living bee. The scape is labeled “Sc” and appears divided into 2 branches, with 1 side ending as a small spur, labeled “S.” Other labeled parts are “T” for torulus (basal socket joint that allows antenna movement), “R” for radicle (antenna joint attached to the head), and “P” for pedicle (antenna segment that creates an elbow-like joint with the scape).

    Image via George Poinar Jr./ BioOne Complete.

    Poinar continued:

    The fossil record of bees is pretty vast, but most are from the last 65 million years and look a lot like modern bees. Fossils like the one in this study can tell us about the changes certain wasp lineages underwent as they became palynivores, or pollen eaters.

    There were pollen grains on the bee, indicating it had visited some flowers not long before it died.

    Also present were very young beetle larvae on the bee. These parasitic larvae were not feeding on it, but were hitching a ride from one of the flowers visited by the bee to its nest. At the nest, the parasitic beetle larvae would continue to develop, feeding on bee larvae and the food left by the adult bee.

    Closeup view of bee leg covered in hair, with very many dots of pollen caught between the hairs.

    Microscopic imaging reveals pollen on the bee’s pollen-catching hairs. It had visited flowers shortly before becoming trapped in tree resin.

    Image via George Poinar Jr./ OSU.

    Poinar observed:

    Additional evidence that the fossil bee had visited flowers are the 21 beetle triungulins – larvae – in the same piece of amber that were hitching a ride back to the bee’s nest to dine on bee larvae and their provisions, food left by the female.

    It is certainly possible that the large number of triungulins caused the bee to accidently fly into the resin.

    Closeup view of a long segmented beetle larva.

    One of the young larval beetles. Poinar counted a total of 21 larvae on this bee. These larvae are carried by the adult bee from a flower to the nest, where the larvae parasitize bee larvae and eat the food collected by the adult bee.

    Image via George Poinar Jr./ OSU.

    https://earthsky.org/ }

    20-02-2020 om 23:32 geschreven door peter  

    0 1 2 3 4 5 - Gemiddelde waardering: 0/5 - (0 Stemmen)
    Categorie:Diversen (Eng, NL en Fr)
    19-02-2020
    Klik hier om een link te hebben waarmee u dit artikel later terug kunt lezen.Giant skeleton searchers call off dig

    Giant skeleton searchers call off dig

    Susan StrongmanReporter, In Depth

    A secretive group who spent four years tunnelling into the side of a country road in search of a mythical race of pre-Polynesian giants' skeletons have called off their dig.

    But one of the diggers, who has revealed his identity via Facebook, has warned a "reiki protection is on the cave dig".

    Men in the 'secret' cave - Waikaretu Valley

    The diggers have excavated a tunnel bout 14 metres into the hillside.

    Photo: Supplied

    Last week, RNZ revealed iwi, academics and the landowner were concerned by the anonymous group's dig in the Waikaretu Valley, west of Huntly.

    READ MORE: Concerns over secret search for giants' bones near Huntly

    The group say this bone belongs to a giant pre-Polynesian human and could be more than 2500 years old. Experts say it's likely from a moa. Photo / Supplied

    The group say this bone belongs to a giant pre-Polynesian human and could be more than 2500 years old. Experts say it's likely from a moa.

    Photo / Supplied

    The group, who updated their progress on a blog, were searching for evidence of pre-Polynesian inhabitants of New Zealand.

    They believed they had found a bone in the tunnel that belonged to a giant human up to 2500 years old.

    But after viewing photos and a video of the bone, multiple experts told RNZ it likely belonged to a moa.

    The dig was done without the consent of the landowner, or consultation with iwi who have tīpuna and taonga buried in the north west Waikato area's limestone caves.

    Archaeologist Dr Siân Halcrow expressed concern that the group's fossicking behaviour could damage the archaeological record.

    In a blog post on Saturday, the group announced they would abandon the dig, writing that the world will "now never know for sure if this cave was filled by hand specifically to hide some fourteen 8'+ pre-Polynesian skeletons."

    In the post, the group said they would focus on three other locations in their search for proof that a race of eight foot humans beat Polynesians to become the first humans in Aotearoa, which they told RNZ would be "the most talked about worldwide story of the millennium."

    Today, Rodney Davidson, a reiki practitioner from Northland, confirmed he was involved in the dig.

    He posted a warning on Facebook: "Be aware that a Reiki protection is on the cave dig and has been since the start too. It has made it,s [sic] presence felt on at least two occasions to great benefit in fact. Abuse it in anyway and there will be a ' result ' ! I have no control over this so all your choice!"

    There is no evidence of human habitation of Aotearoa New Zealand prior to the arrival of Polynesians.

    The pervasive myth that an earlier population of Moriori was displaced by Māori has been repeatedly rejected by academics.

    The 1916 and 1946 editions of the School Journal taught generations of school children many myths about Moriori. They include that they were wiped-out by Māori during an 1835 invasion, and that they were conquered due to their inferiority.

    A true account of the history of the iwi is about to be entrenched in law.

    Other alternative histories suggest that prior to the arrival of Polynesians, the country was settled by Egyptians, Celts, Greeks, Chinese, Melanesians, or Phoenicians.

    Evidence from the archaeological record, linguistics and DNA analysis shows Polynesians first arrived in New Zealand in the 14th century.

    Halcrow said "conspiracy theories" about the settlement of New Zealand by non-Polynesians were "grounded in racist ideologies."

    She raised concerns about the number of people following the group's blog, saying, "It does really highlight what some New Zealanders think, in terms of pre-Māori conspiracy theories, with really racist undertones. It's not grounded in fact, so people should be aware."

    Eru Whare of Ngāti Taahinga, chairman of Pukerewa Marae which is near where the group was digging, said, "I wouldn't put it down to racism. I think it would be a lack of education and understanding of cultural values."

    "It's very hard for our people to try and decipher why people would do such things. And whether they are looking for, you know, big giants or moas. I mean I can understand... But for guys just going in there without any consultation. Well, that's something else. That's a pretty disturbing approach."

    University of Waikato teaching fellow Dr M Dentith, who studies conspiracy theory, fake news, and secrecy, said theories about pre-Polynesian inhabitants of New Zealand were often used to make some variation of the claim, "'Well, if white people were here first, then the Treaty is null and void', or 'We did to Māori only what they did to our distant ancestors'".

    Dentith said much of this could be put down to a lack of education around New Zealand's history and prehistory.

    https://www.rnz.co.nz/ }

    19-02-2020 om 16:59 geschreven door peter  

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    Klik hier om een link te hebben waarmee u dit artikel later terug kunt lezen.A Secret Search for Giants Has Been Going On in New Zealand

    A Secret Search for Giants Has Been Going On in New Zealand

    “(The world will) now never know for sure if this cave was filled by hand specifically to hide some fourteen 8’+ pre-Polynesian skeletons.”

    There’s a mini war of sorts underway in New Zealand over … giants! A reporter for Radio New Zealand (RNZ) has brought to light a hunt that has been underway for some time for evidence of giants that the searchers believe lived on the island prior to the Polynesians who arrived between 1250 and 1300 and developed the Māori culture. The group calls itself Tangata Whenua (Māori for “people of the land”) and, according to its website, has been secretly digging (often at night) a cave or tunnel since 2016 in the Waikato region in northern New Zealand for evidence of the 8-foot tall giants that they believe have been found before in 16 locations. The website states that the group knows of four of these sites and, earlier this month, they found what they claim is part of a femur from what would have been a being 7’10” to 8’4″ tall and lived 2500 years ago. (You can read the account and see a photo here.)

    “But after viewing photos and a video of the bone, multiple experts told RNZ it likely belonged to a moa.”

    Moa

    RNZ reporter Susan Strongman has been reporting on the secret dig that has annoyed the landowner, who says they never asked permission, and archeologists and indigenous people, who say the hunters are not archeologists and risk harming historical artifacts and human remains. Strongman raised the heat on the group by revealing the name of one member — Rodney Davidson, a reiki practitioner from Northland. In a response on the group website and on his Facebook page, he defended the hunt, criticized Strongman and admitted that the group has stopped looking in that area, so no one will ever know for sure in the cave has giant skeletons in it. He said they will continue their clandestine searches in the other caves whose locations are apparently still secret.

    “Be aware that a Reiki protection is on the cave dig and has been since the start too. It has made it,s [sic] presence felt on at least two occasions to great benefit in fact. Abuse it in anyway and there will be a ‘ result ‘ ! I have no control over this so all your choice!”

    Along with the warning that a reiki aura or shield is protecting the cave, Davidson also gave out her twitter and email addresses for his supporters to send their responses – supporters whose numbers he claims have risen since she broke the story.

    Meanwhile, experts like Otago University associate professor of bioarchaeology Dr Siân Halcrow agree that the bone is probably from a moa (a large extinct flightless bird resembling the emu), there is no evidence of any humans or human-like species of any size on New Zealand prior to the Māori (thus, no evidence that the Māori killed them off – a popular but unproven theory), and any searches for pre-Polynesian giants are disconcerting.

    “It does really highlight what some New Zealanders think, in terms of pre-Māori conspiracy theories, with really racist undertones. It’s not grounded in fact, so people should be aware.”

    Māori

    Archaeologist Sian Keith told RNZ that archeologists seek evidence and are passionate and thorough, so talk of coverups and secrecy in his field are upsetting. That may be true among his own colleagues, but there are plenty of stories from Egypt, Central America and other archeology sites that would disagree.

    As with any war of words, deep-seated beliefs, secrecy, conspiracy theories and conflicting information, this one is far from over.

    https://mysteriousuniverse.org/ }

    19-02-2020 om 16:14 geschreven door peter  

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    18-02-2020
    Klik hier om een link te hebben waarmee u dit artikel later terug kunt lezen. KLIMAATVERANDERING: ZOU DE ZON DE BOOSDOENER KUNNEN ZIJN?

    https://www.scientias.nl/ }

    18-02-2020 om 17:10 geschreven door peter  

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    Categorie:Diversen (Eng, NL en Fr)
    Klik hier om een link te hebben waarmee u dit artikel later terug kunt lezen.NASA geeft toe dat de klimaatverandering natuurlijk is en veroorzaakt wordt door de zon

    NASA geeft toe dat de klimaatverandering natuurlijk is en veroorzaakt wordt door de zon

    Al meer dan 60 jaar weet de National Aeronautics and Space Administration (NASA) dat veranderingen in de weersomstandigheden op de planeet volkomen natuurlijk en normaal zijn. Maar het ruimteagentschap heeft, om welke reden dan ook, besloten om de zogenaamde door de mens veroorzaakte opwarmingszwendel te laten voortbestaan en zich te laten verspreiden, ten koste van de menselijke vrijheid.

    Activiteit op de zon.

    Afbeelding: NASA / GSFC / Solar Dynamics Observatory.

    Het was in 1958, om precies te zijn, toen NASA voor het eerst opmerkte dat veranderingen in de zonnebaan van de aarde en veranderingen in de helling van de aarde verantwoordelijk waren voor wat klimaatwetenschappers vandaag de dag “opwarming” (of “afkoeling”, afhankelijk van hun agenda) noemen. Met andere woorden, op geen enkele manier verwarmt of koelt de mens de planeet door verbrandingsmotor-voertuigen te rijden of rundvlees te eten.

    In 2000 publiceerde NASA op zijn website van het Earth Observatory informatie over de klimaattheorie van Milankovich, waaruit blijkt dat de planeet in werkelijkheid door externe factoren veranderd die absoluut niets met menselijke activiteiten te maken hebben. Maar ook deze informatie is na 19 jaar nog steeds niet in de mainstream media terechtgekomen en daarom beweren “klimaatbeschermers” nu dat we eigenlijk nog maar 18 maanden of 12 jaar over hebben voordat de planeet sterft aan een overschot aan kooldioxide (CO2).

    Maar de waarheid is veel meer in overeenstemming met wat de Servische astrofysicus Miloetin Milankovitsj, naar wie de klimaattheorie van Milankovitsj is genoemd, heeft gesuggereerd over hoe de seizoensgebonden en latitudinale variaties in zonnestraling, die de aarde op verschillende manieren en in verschillende tijden raken, de grootste invloed hebben op de veranderende klimaatpatronen van de aarde.

    De volgende twee afbeeldingen (door Robert Simmon, NASA GSFC) helpen dit illustreren, de eerste toont de Aarde in een baan dicht bij nul (Excentriciteit: van excentrisch, afwijkend van het centrum) en de tweede toont de Aarde in een baan van 0,07. Deze orbitale verandering wordt weergegeven door de excentrische, ovale vorm in het tweede beeld, die opzettelijk is overdreven om de massale verandering in de afstand tussen de aarde en de zon te laten zien, afhankelijk van of het in het perihelium of het aphelium is.

    “Zelfs de maximale excentriciteit van de baan van de aarde – 0,07 – zou niet representatief zijn bij de resolutie van een website”merkt de Hal Turner Radio Show op.

    Desalniettemin, bij de huidige excentriciteit van 0,017 in het perihelium, is de aarde vijf miljoen kilometer dichter bij de zon dan in het aphelium.”

    De grootste factor die het klimaat op aarde beïnvloedt is de zon

    Wat betreft de helling van de aarde of de verandering in de axiale helling, laten de twee onderstaande afbeeldingen (Robert Simmon, NASA GSFC) zien hoeveel de aarde kan verschuiven, zowel op haar as als rond haar rotatieoriëntatie. Bij hogere neigingen worden de seizoenen van de aarde veel extremer, terwijl ze bij lagere neigingen veel milder worden. Op dezelfde manier kan de draaias van de aarde een sterke invloed hebben op de seizoensgebonden extremen tussen de twee hemisferen, afhankelijk van welke hemisfeer in het perihelium is uitgelijnd met de Zon.

    Er moet worden vermeld dat “klimaat” in het Nederlands “gesteldheid” betekent. Het woord is gekozen omdat de hele dagzijde van de aarde gelijkelijk door de zon wordt bestraald, maar de opwarming hangt uitsluitend af van de invalshoek, de helling van de stralen ten opzichte van het aardoppervlak. Op de warme evenaar is de hoek ongeveer 90%; op de koude polen is hij veel vlakker.

    NASA verbergt pagina die zegt dat de zon de primaire klimaatstimulans is, en wolken en deeltjes belangrijker zijn dan broeikasgassen

    Wat verbergt NASA in hemelsnaam? De NASA site had vroeger een pagina met de titel (‘What are the primary forcings of the Earth system?’, (‘Wat zijn de primaire krachten van het aardse systeem’). In 2010 zei deze pagina dat de zon de belangrijkste drijvende kracht achter het klimaat van de aarde is, dat het alle … Meer lezen over NASA verbergt pagina die zegt dat de zon de primaire klimaatstimulans is, en wolken en deeltjes belangrijker zijn dan broeikasgassen

    Milankowitsch was in staat om uit deze verschillende variabelen een uitgebreid wiskundig model te ontwikkelen dat de oppervlaktetemperaturen op de aarde ver terug in de tijd kan berekenen, en de conclusie is eenvoudig: het klimaat op aarde is altijd al aan het veranderen geweest en is in een staat van constante verandering, zonder onze tussenkomst als mens.

    Toen Milankovitsj zijn model voor het eerst presenteerde, werd het bijna een halve eeuw lang genegeerd. Vervolgens, in 1976, bevestigde een studie in het tijdschrift Science dat de theorie van Milankovich inderdaad juist was en dat deze overeenkwam met verschillende perioden van klimaatverandering die zich in de loop van de geschiedenis hebben voorgedaan.

    In 1982, zes jaar na de publicatie van deze studie, accepteerde de National Research Council van de Amerikaanse National Academy of Sciences de theorie van Milankovich als reëel en verklaarde deze waar:

    “… orbitale variaties blijven het meest grondig bestudeerde mechanisme van klimaatverandering op tijdschalen van tienduizenden jaren en zijn veruit het duidelijkste geval van een direct effect van veranderende zonnestraling op de lagere atmosfeer van de aarde.”

    Als we het geheel in één simpele zin zouden moeten samenvatten, zou het zo zijn: De grootste factor die het weer- en klimaatpatroon op aarde beïnvloedt is de zon, of beter gezegd de periode van de zon. Afhankelijk van de positie van de aarde ten opzichte van de centrale ster op een bepaald moment, zullen de klimaatomstandigheden dramatisch variëren en zelfs drastische anomalieën veroorzaken die alles wat mensen dachten te weten over hoe de aarde werkt op de proef stellen.

    Maar in plaats van dit feit te accepteren, dringen de huidige klimaat “wetenschappers”, samen met de linkse, en steeds meer rechtse politici, en natuurlijk de massamedia, erop aan dat niet-herbruikbare boodschappentassen in de supermarkt en geen elektrische voertuigen de planeet snel zullen vernietigen, en dat we absoluut een globale klimaatbelasting als oplossing moeten invoeren.

    Het klimaatdebat gaat niet over wetenschap. Het is een poging om de bevolking politiek en economisch te controleren door de elite”, schrijft een commentator op de Hal Turner Radio Show.

    En het is een andere manier om de bevolking te verdelen tegen zichzelf, waarbij sommigen geloven in de door de mens veroorzaakte opwarming van de aarde en anderen niet geloven, dat wil zeggen verdeel en heers.

    Een nieuwe studie toont aan dat de klimaatverandering niet afhankelijk is van de menselijke CO2-uitstoot

    Het lijkt erop dat de woorden “opwarming van de aarde” onlangs zijn vervangen door “klimaatverandering”, en degenen die niet geloven in, of twijfelen over het verband tussen “klimaatverandering” en “kooldioxide” worden “klimaatontkenners” genoemd, wat naar mijn mening een heel slecht gekozen woord is, omdat ik denk dat niemand ontkent dat er een klimaat is. De … Meer lezen over Een nieuwe studie toont aan dat de klimaatverandering niet afhankelijk is van de menselijke CO2-uitstoot

    solar irradiance

    The above graph compares global surface temperature changes (red line) and the Sun's energy received by the Earth (yellow line) in watts (units of energy) per square meter since 1880. The lighter/thinner lines show the yearly levels while the heavier/thicker lines show the 11-year average trends. Eleven-year averages are used to reduce the year-to-year natural noise in the data, making the underlying trends more obvious.

    The amount of solar energy received by the Earth has followed the Sun’s natural 11-year cycle of small ups and downs with no net increase since the 1950s. Over the same period, global temperature has risen markedly. It is therefore extremely unlikely that the Sun has caused the observed global temperature warming trend over the past half-century.

    https://www.nasa.gov/

    https://fenixx.news/ }

    18-02-2020 om 16:54 geschreven door peter  

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    Klik hier om een link te hebben waarmee u dit artikel later terug kunt lezen.Meet the Reaper of Death, a new Canadian tyrannosaur

    Meet the Reaper of Death, a new Canadian tyrannosaur

    A new tyrannosaur species named Thanatotheristes, which means

    Tyrannosaurus head with mouth open showing pointed teeth.

    Artist’s concept of Thanatotheristes degrootorum, named for John De Groot.

    Image via Julius Scotonyi / Royal Tyrrell Museum.

    Canadian paleontologists have identified a new tyrannosaur species, identified from fossils found in southern Alberta. It’s a large bipedal carnivorous dinosaur that lived about 79 million years ago, making it the oldest known tyrannosaur in northern North America (the previous record holder was aged at 77 million years). Details about this new dinosaur and its evolutionary relationship to other tyrannosaurs were published in the journal Cretaceous Research.

    John De Groot, a farmer and amateur paleontologist, found the creature’s fossilized jawbone in 2010 while he was hiking along the Bow River shoreline near the town of Hays, about 120 miles (200 km) southeast of Calgary. It had fallen to the ground from a nearby cliff. In a statement from the Royal Tyrrell Museum, De Groot said:

    The jawbone was an absolutely stunning find. We knew it was special because you could clearly see the fossilized teeth.

    John De Groot, standing outside in the sunshine, holds two fossil pieces, upper and lower jawbones.

    John De Groot holding casts of Thanatotheristes degrootorum‘s jaw bones. The new dinosaur species was named after him.

    Image via John and Sandra De Groot.

    Scientists named the new tyrannosaur Thanatotheristes degrootorum. They picked a genus name apt for an apex predator, Thanatotheristes, after Thanatos, the Greek god of death, and theristes, which means one who reaps or harvests.

    The dinosaur’s species name, degrootorum, was in honor of John De Groot. Sandra De Groot, his wife, commented:

    John always said that one day he would find a dinosaur skull. Finding the jaw was exciting. Hearing that it is a new species, and seeing it given our family name, was beyond belief.

    The fossils – pieces of the tyrannosaur’s skull and its upper and lower jaw bone – stayed tucked away in a drawer at the Royal Tyrrell Museum, in Drumheller, Alberta, until the spring of 2019. That’s when University of Calgary’s Jared Voris began to study it.

    In a statement from the University of Calgary, Voris, the paper’s lead author, said:

    We found features of the skull that had not been seen before in other tyrannosaurs. The fossil has several physical features, including ridges along the upper jaw, which clearly distinguishes it as being from a new species.

    Voris thinks that Thanatotheristes was about 26 feet (8 meters) in length, and likely preyed on large plant-eating dinosaurs like Xenoceratops and Colepiocephale.

    A finger points to the vertical ridges along the length of Thanatotheristes degrootorum's upper jaw.

    Vertical ridges along the length of Thanatotheristes degrootorum‘s upper jaw indicated that it was a new tyrannosaur species.

    Image via Jared Voris/ Royal Tyrrell Museum.

    When most people think of tyrannosaurs, it’s the iconic Tyrannosaurus rex that springs to mind. T. rex is engrained in our popular culture, in books and movies, toys and artwork, and lately, in people who run around in inflatable T. rex suits. T. rex lived in present day western North America, around 68 to 66 million years ago. But there are other tyrannosaur species as well, identified from fossils in North America, and paleontologists are trying to understand their evolutionary story.

    François Therrien, a paper co-author, commented that their findings are revealing more about the diversity of tyrannosaurs during the Cretaceous period. He said:

    This discovery is significant because it fills in a gap in our understanding of tyrannosaur evolution.

    A photo showing four of the paper authors standing behind a table with fossils on it.

    The paper authors: Darla Zelenitsky, Jared Voris, Caleb Brown, and François Therrien.

    Image via Royal Tyrrell Museum.

    In their study, the scientists found that Thanatotheristes degrootorum was closely related to two other tyrannosaur species, Daspletosaurus torosus and Daspletosaurus horneri. This trio had common skull features: they had deeper longer snouts and more teeth in their upper jaws than their southern relatives which Voris described as having shorter, bulldog-like faces.

    Partial jawbone fossils shown against outline of complete jaw.

    Thanatotheristes degrootorum‘s jaw bones.

    Image via Jared Voris/ University of Calgary.

    The scientists think that differences in tyrannosaur species – in body shape and size – are adaptations to their environment. Voris said:

    Some species are better suited to certain environments. This reduces competition and gives species a better chance at survival.

    The next step is to test that hypothesis further and compare how tyrannosaur species from various geological regions differed.

    White tyrannosaur with striped tail and red head in a jungle setting.

    Artist’s depiction of Thanatotheristes degrootorum.

    Image via Julius Csotonyi.

    https://earthsky.org/ }

    18-02-2020 om 01:28 geschreven door peter  

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    Klik hier om een link te hebben waarmee u dit artikel later terug kunt lezen.Mysterious skull washes up on UK beach with ‘no eye sockets’

    Mysterious skull washes up on UK beach with ‘no eye sockets’

    Grisly remains prompt hunt for answers

    Harry Cockburn

    What is this mystery skull found on a Lincolnshire beach?

    What is this mystery skull found on a Lincolnshire beach? 
    ( Supplied )

    A mysterious skull which appears to have no eye sockets has washed up on a beach in Lincolnshire sparking debate as to what kind of animal it might have belonged to.

    The skull, which was discovered at the Gibraltar Point National Nature Reserve, was found by a woman who was walking her dog and picking up litter, according to the Lincolnshire Echo.

    When she found the grisly specimen she reportedly “couldn’t believe her eyes”.

    “I think it's definitely a washed up seal skull that's been bashed about by the tide,” the woman, who wishes to remain anonymous, said.

    “The top part of the jaw is missing and the bottom jaw is out of place by the looks of it.”

    She posted photographs of the grisly remains online, with several people trying to work out what it was.

    Initial inquiries by The Independent included the suggestion from a London veterinarian that the skull could be the remains of a brachycephalic dog, such as a French bulldog or a pug, which have flat faces and short snouts.

    They said from the photographs the creature appeared to have canines, indicating it was from a carnivorous animal. The lack of any discernible eye sockets, led to the suggestion it could have been a malformed puppy.

    The plot thickened as the vet said the reddening of the skull could be due to haemorrhage which would suggest evidence of a head trauma, but she also noted the reddening of the skull can also happen after death if the body is left lying on one side so the blood pools.

    However, the plot then thinned somewhat after experts from the Natural History Museum and the Grant Museum positively identified the specimen.

    The mystery skull
    (Supplied)

    The mystery animal from the sea is none other than a common seal.

    A spokesperson for the Natural History Museum said: “According to our principal curator of mammals, Richard Sabin, it is a seal skull and it is missing the front part of the skull which holds the upper dentition.

    “According to Richard, it’s tricky to identify species from the single photograph online, but the shape of the check teeth appears consistent with the common seal, Phoca vitulina. Common seals are known to occur at Gibraltar Point.”

    Experts at UCL’s Grant museum concurred. Zoology curator Tannis Davidson said: "I’ve taken a look at this and its looks like a seal skull:  Phoca vitulina.

    “The front of the cranium is broken so only the posterior part of the orbit is visible with lack of post-orbital processes suggesting that it is a seal rather than a dog."

    She added: “The alignment of the teeth in the mandible are typical of Phoca vitulina as well as the dental morphology.”

    The woman who found the skull told The Independent: “I was litterpicking and just walking my dog on the beach. I do a lot of regular litterpicks.

    “I suspected it was a seal skull and it does appear to be one.”

    She added: “It's quite common for bones and strange things to wash up on our coast just not every day you find a seal skull but loads do get washed up.”

    Seal skull found on a beach. Mystery solved.

    https://www.independent.co.uk/ }

    18-02-2020 om 00:57 geschreven door peter  

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    Categorie:Diversen (Eng, NL en Fr)
    17-02-2020
    Klik hier om een link te hebben waarmee u dit artikel later terug kunt lezen.People in West Africa still carry 'beneficial' genes from a mystery ancient human ancestor that protects them against tumours

    People in West Africa still carry 'beneficial' genes from a mystery ancient human ancestor that protects them against tumours

    • Experts at the University of California Los Angeles are behind the finding
    • They devised a statistical method able to highlight abnormal genetic code
    • This was applied to the DNA of 50 modern Yoruba people in West Africa
    • Roughly eight per cent of their DNA comes from a yet unknown 'ghost' species
    • Hominin species Homo heidelbergensis is believed to be the likely candidate

    Evidence of an unknown species of human ancestor has been found hiding in the DNA of West African people.

    Experts made the finding by analysing the human genome, looking for strings of genetic information that were out of place.

    This revealed an inheritance of markers from an unidentified human-like species, some of which may be of benefit to their descendants - including one which suppresses the development of tumours. 

    Researchers believe an ancient species of hominin, known as Homo heidelbergensis, may be the most likely candidate for the 'ghost' species.

    Scroll down for video 

    Mysterious evidence of an unknown species of human ancestor has been found hiding in the DNA of West African people. Homo heidelbergensis (artist's model) was an early human ancestor that experts believe may be the most likely candidate 

    Mysterious evidence of an unknown species of human ancestor has been found hiding in the DNA of West African people. Homo heidelbergensis (artist's model) was an early human ancestor that experts believe may be the most likely candidate 

    The finding was made by Arun Durvasula and Sriram Sankararaman, researchers at the University of California, Los Angeles. 

    They devised a statistical method able to highlight abnormal genetic code without needing the genome of the species it was inherited from.

    This bypasses the need for DNA extracted from extinct African hominins as a basis of comparison.

    The hotter and wetter climate on the African continent tends to destroy any preserved DNA, unlike samples of human-like species the Neanderthals and Densiovans uncovered in Europe and Asia.   

    The statistical technique was applied to the DNA of 50 modern Yoruba who had their genetic information sequenced as part of the 1,000 Genomes Project.

    This established that roughly eight per cent of their DNA comes from a yet unknown 'ghost' species.

    Ancestor species like the Neanderthals and Denisovans have been ruled out of the equation, as we already have their DNA and there is no evidence to suggest they lived in Africa. The journey of Neanderthals and the evolution of Homo sapiens was intertwined for thousands of years

    Ancestor species like the Neanderthals and Denisovans have been ruled out of the equation, as we already have their DNA and there is no evidence to suggest they lived in Africa. The journey of Neanderthals and the evolution of Homo sapiens was intertwined for thousands of years

    While Homo sapiens may be the only hominin species alive today, tens of thousands of years ago the planet was home to a variety of human and protohuman species. 

    As the result of interspecies breeding, some of these species' DNA has been passed down to modern humans.

    Traces of Neanderthal DNA are still found in people of non-African descent and Denisovan DNA lives on in people of Asian heritage.

    Researchers also learned in 2016 that the DNA of an unknown population of archaic hominins continues to exist in Pacific Island peoples.

    The Neanderthals and Denisovans have been ruled out of the equation, as we already have their DNA and there is no evidence to suggest they lived in Africa. 

    WHAT DO WE KNOW ABOUT THE HUMAN ANCESTOR SPECIES HOMO HEIDELBERGENSIS?

    Homo heidelbergensis lived in Africa, Europe and western Asia between 600,000 and 200,000 years ago.

    It was an early human ancestor that went extinct long before modern humans migrated to Eurasia from Africa. 

    Hundreds of thousands of years ago, the ancestors of modern humans diverged from a lineage that gave rise to Neanderthals and Denisovans.

    Research published by scientists from the University of Utah in August 2017 now suggests that Neanderthals and Denisovans diverged from each other around 744,000 years ago - around 300,000 earlier than previously believed.

    This implies that Homo heidelbergensis may have been an early Neanderthal. 

    Researchers have previously suggested that, between 400,000 and 300,000 years ago, a group of heidelbergensis migrated into Europe and West Asia via yet unknown routes and eventually evolved into Neanderthals   

    Homo heidelbergensis' evolutionary tree has largely baffled scientists due to scarce fossil records.

    The similarity between Neanderthal, Homo heidelbergensis and Homo sapien fossils means researchers previously thought heidelbergensis fossils were simply variants of Homo sapiens.

    Modern-day pygmies, who may have interbred with the Yoruba people have also been eliminated from the process, as their DNA has been sequenced and it is not a match. 

    A small-brained hominin that could be found roaming around the South African plains 250,000 years ago, Homo naledi, is a possible but unlikely contender. 

    Researchers believe they were too different from us genetically to be able to mate and reproduce successfully   

    'I would be amazed if there was anything of them in us,' said Mark Thomas of University College London, who was not involved in the study, speaking to New Scientist about the finding.

    Experts made the fining thanks to a statistical method which is able to highlight abnormal genetic code without needing the genome of the species it was inherited from. This established that 8% of Yoruba DNA comes from a yet unknown 'ghost' species

    Experts made the fining thanks to a statistical method which is able to highlight abnormal genetic code without needing the genome of the species it was inherited from. This established that 8% of Yoruba DNA comes from a yet unknown 'ghost' species

    Homo heidelbergensis was a more advanced hominin living in Africa around 200,000 years ago and a more probable candidate.

    It could also be that the mystery DNA came from an isolated group of Homo sapiens or population of hominins that are as yet unknown to researchers. 

    Whatever the answer turns out to be, the study is a reminder that our species did not emerge from a single founding population, Professor Thomas told New Scientist 

    The full findings of the study are available in a paper published in the online print repository bioRxiv

    WHEN DID HUMAN ANCESTORS FIRST EMERGE?

    The timeline of human evolution can be traced back millions of years. Experts estimate that the family tree goes as such:

    55 million years ago - First primitive primates evolve

    15 million years ago - Hominidae (great apes) evolve from the ancestors of the gibbon

    7 million years ago - First gorillas evolve. Later, chimp and human lineages diverge

    A recreation of a Neanderthal man is pictured 

    A recreation of a Neanderthal man is pictured 

    5.5 million years ago - Ardipithecus, early 'proto-human' shares traits with chimps and gorillas

    4 million years ago - Ape like early humans, the Australopithecines appeared. They had brains no larger than a chimpanzee's but other more human like features 

    3.9-2.9 million years ago - Australoipithecus afarensis lived in Africa.  

    2.7 million years ago - Paranthropus, lived in woods and had massive jaws for chewing  

    2.6 million years ago - Hand axes become the first major technological innovation 

    2.3 million years ago - Homo habilis first thought to have appeared in Africa

    1.85 million years ago - First 'modern' hand emerges 

    1.8 million years ago - Homo ergaster begins to appear in fossil record 

    800,000 years ago - Early humans control fire and create hearths. Brain size increases rapidly

    400,000 years ago - Neanderthals first begin to appear and spread across Europe and Asia

    300,000 to 200,000 years ago - Homo sapiens - modern humans - appear in Africa

    50,000 to 40,000 years ago - Modern humans reach Europe 

    17-02-2020 om 20:59 geschreven door peter  

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    Klik hier om een link te hebben waarmee u dit artikel later terug kunt lezen.The 'Ghosts' of 2 Unknown Extinct Human Species Have Been Found in Modern DNA

    main article image

    The 'Ghosts' of 2 Unknown Extinct Human Species Have Been Found in Modern DNA

    MICHELLE STARR

    When modern humans started emerging from Africa and spreading throughout Eurasia, they found many places already occupied by older hominins such as Neanderthals and Denisovans. As humans do, we got rather friendly with our new neighbours: evidence of that hanky panky lives on in our DNA today.

    But we're also starting to find glimpses of something strange in our neighbourhoods - traces of ancient, unknown hominins that we've never seen before.

    "Each of us carry within ourselves the genetic traces of these past mixing events," said biologist João Teixeira of the University of Adelaide.

    "These archaic groups were widespread and genetically diverse, and they survive in each of us. Their story is an integral part of how we came to be."

    After closely analysing the existing literature, Teixeira and his colleague biologist Alan Cooper have identified two such 'ghost' ancestors in modern DNA. The first, identified in Eurasian DNA with the help of artificial intelligence, was widely reported earlier this year.

    The second, however, was reported last year, a detail that flew under the radar in a larger paper: a mysterious, and inconclusive, genetic signature exclusively found in the population of Flores, Indonesia. It appears to be as divergent from modern human DNA as Neanderthal or Denisovan DNA is.

    By carefully analysing these genetic signatures, the biologists have been able to trace when and where these interbreeding events may have occurred.

    "For example, all present-day populations show about 2 percent of Neanderthal ancestry," Teixeira said, "which means that Neanderthal mixing with the ancestors of modern humans occurred soon after they left Africa, probably around 50,000 to 55,000 years ago somewhere in the Middle East."

    As the modern humans moved farther east, across into islands of Southeast Asia, they seem to have run into more groups.

    "At least three other archaic human groups appear to have occupied the area, and the ancestors of modern humans mixed with them before the archaic humans became extinct," Teixeira said.

    One of those groups was the Denisovans. The other two remain a mystery.

    The first unknown extinct hominin - named EH1 - was roughly genetically equidistant from Denisovans and Neanderthals. The ancestor of all Asian and Australo-Papuan populations bred with EH1, resulting in 2.6 to 3.4 percent shared EH1 ancestry.

    mixing events

    (João Teixeira)

    It's less strong now, but that genetic signal can still be detected in the DNA of Aboriginal Australians, East Asians and Andaman Islanders. This led the researchers to tentatively conclude that EH1 likely occupied a region in northern India, where a group of modern humans - the migration branch that went on to Asia, Australia and the Papuan islands - encountered them (1 on the map above).

    Modern humans also seemed to have interbred with Denisovans in a number of locations, such as East Asia, the Sunda Shelf, and the Philippines (2, 3, and 4 on the map).

    Evidence for EH2 - the extinct hominin that interbred with modern humans on Flores - is a little less clear. It only appears in short-statured people that live near Liang Bua Cave - where Homo floriensis was discovered. So it's highly localised, and has somehow remained contained for the roughly 50,000 years since the two groups met (5 on the map).

    Further research is obviously required into this phenomenon. But it certainly seems to point to a very tangled human history.

    "We knew the story out of Africa wasn't a simple one, but it seems to be far more complex than we have contemplated," Teixeira said.

    "The Island Southeast Asia region was clearly occupied by several archaic human groups, probably living in relative isolation from each other for hundreds of thousands of years before the ancestors of modern humans arrived."

    Sadly, it also looks like the arrival of modern humans was pretty closely followed by the extinction of the archaic hominins in each area. Talk about being ghosted.

    The research has been published in PNAS.

    https://www.sciencealert.com/ }

    17-02-2020 om 20:46 geschreven door peter  

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    Klik hier om een link te hebben waarmee u dit artikel later terug kunt lezen.Ghost DNA Shows Human Ancestors Interbred With Mysterious Unknown Hominins

    Ghost DNA Shows Human Ancestors Interbred With Mysterious Unknown Hominins

    DNA ancestry tests were a popular Christmas gift in 2018 but not so much during the 2019 holidays, according to the latest reports. While the general public (at least in the U.S.) have moved on to the next shiny object (concerned about the privacy and lack of real usefulness of the tests), a group of West Africans who participated in a worldwide genome project searching for evidence of ancient ancestors in modern humans learned that they possess a “ghost DNA” of a mysterious, ancient hominin … one who apparently had a lot of interbreeding relations with the ancestors of modern humans. Could this explain everything? Anything? Will it help sales of DNA tests?

    “While introgression from Neanderthals and Denisovans has been documented in modern humans outside Africa, the contribution of archaic hominins to the genetic variation of present-day Africans remains poorly understood. We provide complementary lines of evidence for archaic introgression into four West African populations. Our analyses of site frequency spectra indicate that these populations derive 2 to 19% of their genetic ancestry from an archaic population that diverged before the split of Neanderthals and modern humans.”

    In a study published in the journal Science AdvancesSriram Sankararaman, an assistant professor at UCLA in the Computer Science and Human Genetics departments, explains how he and his team examined the genomes of 405 West Africans currently living in Nigeria, Gambia, and Sierra Leone using DNA in collected between 2008 and 2015 as part of the 1,000 Genomes project to find genetic variants with frequencies of at least 1% in the populations studied. While they knew that modern West Africans do not have any Neanderthal or Denisovan ancestry, they were shocked to find a single mysterious ancient hominin whose DNA made up as much as 19% of the genes of those tested.

    “We don’t have a clear identity for this archaic group. That’s why we use the term ‘ghost.’ It doesn’t seem to be particularly closely related to the groups from which we have genome sequences from.”

    Sankararaman told NPR this interbreeding occurred about 50,000 years ago, after humans and Neanderthals split and the latter left for Europe. The ghost group then split of from humans and did some interbreeding before they disappeared, either becoming extinct or being completely assimilated into the human group. Some of the West Africans tested showed minute percentages of Neanderthal DNA, but the researchers believe this came from later Neanderthals who moved back to Africa or modern humans who have interbred with Neanderthals in Europe and then returned to Africa. That’s a LOT of interbreeding. Does it mean anything?

    “Are they just randomly floating in our genomes? Do they have any kind of adaptive benefits? Do they have deleterious consequences? Those are all questions which would be fantastic to start thinking about.”

    According to his interview in Inverse, Sankararaman isn’t sure. In fact, he’s uncertain if this was one ghost group or many, nor does he know what happened to them. Unlike the Neanderthals and Denisovans, fossil evidence of these species has not been found – even in fossil-rich Africa where so many remnants of ancient human ancestors have been discovered.

    A skull would help

    What’s known for certain from this ghost DNA Is that this mysterious group played a big part in the early history of at least four groups of modern West Africans. That’s the kind of information that made DNA testing interesting to begin with.

    Would you want to find out your ancestors were a mysterious group that liked to play the ancient field?

    https://mysteriousuniverse.org/ }

    17-02-2020 om 20:26 geschreven door peter  

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    13-02-2020
    Klik hier om een link te hebben waarmee u dit artikel later terug kunt lezen.Zealandia, the world’s 8th continent, linked to the forging of the Pacific Ring of Fire

    Zealandia, the world’s 8th continent, linked to the forging of the Pacific Ring of Fire

    Zealandia, the world’s 8th continent, linked to the forging of the Pacific Ring of Fire

    A map of Zealandia.
    Credit: Nick Mortimer et al.

    In 2017, geologists made a convincing case that Earth has, in fact, eight continents if you also include Zealandia. Although it is mostly beneath the ocean, with the exception of New Zealand and New Caledonia, Zealandia is mostly made of continental crust rather than the magnesium- and iron-rich ocean crust. For this reason, many believe Zealandia qualifies as a continent.

    New Zealand in sunglint, via NASA Earth Observatory.

    Now, in a new study, researchers have revealed how the long-lost undersea continent evolved since its formation. In the process, they found that Zealandia’s upheaval may have been responsible for the birth of the Pacific Ring of Fire.

    Forging the Ring of Fire

    A new continent in the 21st century? Did it just pop overnight? “This is not a sudden discovery, but a gradual realization,” wrote 11 geologists who authored a 2017 paper published in GSA Today, recommending that ‘Zealandia’ be considered a continent.

    The researchers claim that New Zealand and New Caledonia aren’t just some islands chains — they’re just 5 percent of what’s visible above the ocean’s surface, the rest of the 5-million-square-kilometer continent is submerged underwater. That makes Zealandia about as big as greater India. It would also be the ‘youngest, thinnest, and most submerged’ of the continents,’ according to the authors of the 2017 study.

    Zealandia itself isn’t something new. It was coined by one of the authors of the 2017 paper, Bruce Luyendyk, a geophysicist at the University of California at Santa Barbara, back in 1995. However, originally, Zealandia was used to describe New Zealand, New Caledonia, and a collection of submerged pieces and slices of crust that broke off a region of Gondwana, the supercontinent from 200 million years ago.

    If we could pull the plug on the oceans, it would be clear to everybody that we have mountain chains and a big, high-standing continent,” said Nick Mortimer, a geologist at GNS Science.

    Yet, we still know very little about the submerged continent. But a new study suggests that the story Zealandia is even more amazing than meets the eye.

    An international team of researchers recovered sediments from drilling beneath the ocean floor during a 2017 expedition, then sent them to the lab for analysis. Some of the sediments below the Tasman Sea were laid down as long ago as 100 million years ago.

    The entire expedition lasted nine weeks and involved 32 scientists from all over the world onboard the research vessel JOIDES Resolution. This wasn’t a walk in the park, though — the researchers had to drill as a deep as 5 km (3.1 miles) using a drill that weighed 300 tonnes.

    Encased inside the sediments are tiny fossils, which the researchers used in order to determine the elevation of the sediments when they were deposited. This way, the researchers hoped, they might be able to find out why Zealandia is so different from all the other continents.

    Sites where scientists with the International Ocean Discovery Program drilled for sediments in Zealandia.
    Credit: JOIDES Resolution Science Operator.

    Three sites in the northern region of the continent had the kind of fossils that indicated a shallow reef ecosystem between 35 million and 50 million years ago. Perhaps, some of the areas were terrestrial during that time. Today, these sites are found smack in the middle of the Tasman Sea, close to the Lord Howe Rise deep-sea plateau.

    Close to the New Caledonia Trough, the fossils contained plankton species known to inhabit deeper waters. This indicates that the elevation of Zealandia had dropped in the 35- to 50-million-year time frame.

    The authors of the new study suspect that after northern Zealandia rose and the New Caledonia Trough subsided, the entire continent sunk another 1 km beneath the sea.

    Since the 1970s, the prevailing theory of Zealandia’s formation claimed that its low profile is due to the thinning of its crust after it separated from the supercontinent Gondwana about 85 million years ago. However, these latest findings presented by the expedition of scientists show that portions of the Zealandia rose by 1-2 km while others subsided about the same amount.

    Zealandia, via the Geological Society of America

    Rupert Sutherland, geophysicist at Te Herenga Waka-Victoria University of Wellington and co-author of the new study, claims that this topographic upheaval may be due to the reactivation of ancient faults linked to the formation of the Pacific Ring of Fire — a region known for its relatively frequent earthquakes and volcanic activity

    “Although subduction drives Earth’s plate tectonic cycle, scientists don’t yet understand how it starts,” Dr. Sutherland said.

    “One of the amazing things about our observations is that they reveal the early signs of the Ring of Fire were almost simultaneous throughout the western Pacific,” he added.

    “Because this timing predates the global tectonic plate reorganization, scientists need to find an explanation for how subduction began across such a broad area in such a short time.”

    Sutherland and colleagues have proposed a radical new mechanism that explains these observations: a ‘subduction rupture event’ — a massive but super-slow earthquake, in the researchers’ words. This geological event essentially resurrected ancient subduction faults that had laid dormant for millions of years.

    We don’t know where or why, but something happened that locally induced movement, and when the fault started to slip, like in an earthquake the motion rapidly spread sideways onto adjacent parts of the fault system and then around the western Pacific,” Dr. Sutherland said.

    But unlike an earthquake, the subduction rupture event may have taken more than a million years to unfold.”

    Although the ‘subduction rupture event’ is still a new theory, the evidence so far suggests that such events can quite possibly alter the geography of continents. What’s more, the same events that triggered changes in Zealandia may have to the formation of the Ring of Fire subduction zones around the western Pacific.

    Ultimately, Zealandia’s sedimentary record should help us determine how and why this event happened and what the consequences were for animals, plants, and global climate,” Dr. Sutherland said.

    The process has no modern analogue and because the subduction rupture event is linked to a time of rapid, global plate tectonic change, other instances of such change in the geologic record may imply that comparable events have occurred in the past,” Dr. Sutherland said.

    Geologists generally assume that understanding the present is the key to understanding the past. But at least in this instance, this may not hold.

    The findings appeared in the journal Geology.

    https://www.zmescience.com/ }

    13-02-2020 om 01:36 geschreven door peter  

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    12-02-2020
    Klik hier om een link te hebben waarmee u dit artikel later terug kunt lezen.61% Of People Want The U.S. Government To Make Information On UFOs Public

    61% Of People Want The U.S. Government To Make Information On UFOs Public

    Aliens

    Andrii Vodolazhskyi/Shutterstock

    SMOKE ROOM EDITOR-IN-CHIEF

    A majority of people want U.S. government information on UFOs to be made public.

    According to a study from Piplsay, 61% of people want the government to release any information it might have on UFOs and aliens to the public. (RELATED: The Trailer For ‘Westworld‘ Season 3 Has Been Released. It’s Absolutely Insane)

    The same study found that 58% of people think the government investigates UFOs and aliens, and 27% believe the sightings are real.

    I’m all in on this. I’m all in! Release the files from Area 51 and elsewhere, folks! Let the information flow through the streets and into the minds of the people!

    Ever since the Navy UFO videos of the “tic tac” became public, it seems like people are becoming more and more interested in UFOs.

    Do I think aliens and UFOs are real? Not a clue. I don’t know anything more than you guys do. Of course, a UFO doesn’t naturally mean it’s an alien.

    It just means it’s a flying object that can’t be identified. Now, is it a lot more fun to assume it’s an alien spacecraft? Sure, but that’s not what it means by default.

    Either way, I say live on the edge and declassify everything. Embrace the chaos. If the aliens are here and we need to get into some “X-Files” kind of stuff, then so be it.

    At least let us know!

    Sound off in the comments if you want the government to release their info!

    https://dailycaller.com/ }

    12-02-2020 om 01:26 geschreven door peter  

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    11-02-2020
    Klik hier om een link te hebben waarmee u dit artikel later terug kunt lezen.Exclusive: Strange Russian Spacecraft Shadowing U.S. Spy Satellite, General Says

    Exclusive: Strange Russian Spacecraft Shadowing U.S. Spy Satellite, General Says

    Russian satellite Cosmos 2542 near an American KH-11 satellite identified as USA245.

    Russian satellite Cosmos 2542 near an American KH-11 satellite identified as USA245.
    Courtesy of Michael Thompson

    Apair of Russian satellites are tailing a multibillion-dollar U.S. spy satellite hundreds of miles above the Earth’s surface, a top U.S. military commander tells TIME, underscoring a growing threat to America’s dominance in space-based espionage and a potentially costly new chapter in Washington’s decades-long competition with Moscow.

    Gen. John “Jay” Raymond, commander of the newly minted U.S. Space Force, says the Russian spacecraft began maneuvering toward the American satellite shortly after being launched into orbit in November, at times creeping within 100 miles of it. “We view this behavior as unusual and disturbing,” Raymond says. “It has the potential to create a dangerous situation in space.” Raymond says the U.S. government has expressed concern to Moscow through diplomatic channels.

    The confrontation marks the first time the U.S. military has publicly identified a direct threat to a specific American satellite by an adversary. The incident parallels Russia’s terrestrial encounters with the U.S. and its allies, including close calls between soldiers, fighter jets and warships around the world. Observers worry that space is now offering a new theater for unintentional escalation of hostilities between the long-time adversaries.

    Pentagon, White House and Congressional backers, say the incident demonstrates the need for the Space Force, which President Donald Trump established in December when he signed the National Defense Authorization Act into law. It became the first new military service since the Air Force was created in 1947.

    The Space Force, for which the White House is requesting $15 billion in this week’s budget proposal, represents a strategic shift from passively operating and observing satellites to actively defending them. Space warfare doctrine remains a work in progress, but Raymond has spoken about the need to mobilize Space Command against perceived threats because other nations, especially Russia and China, have become increasingly sophisticated at building arsenals of lasers, anti-satellite weapons and state-of-the-art spacecraft designed to render the U.S. deaf, mute and blind in space.

    At the same time, the expansion of military operations in space harks back to another hallmark of the Cold War competition between Washington and Moscow: massive spending on perceived threats, regardless of the cost.
    For those monitoring waste, fraud and abuse in the military industrial complex, the Russian maneuver and the Pentagon’s response also portends a new front in the effort to keep real and potential threats from becoming a budgetary sinkhole. The history of U.S.-Russia military competition is full of examples of perceived threats that require costly responses.

    “The initial costs of setting up the Space Force are likely a small down payment on an undertaking that could cost tens of billions of dollars in the years to come,” says William D. Hartung, director of the arms and security project at the Center for International Policy. “The last thing we need is more bureaucracy at the Pentagon, but that’s exactly what the Space Force is likely to give us. Creating a separate branch of the armed forces for space also risks militarizing U.S. space policy and promoting ill-advised and dangerous projects that could involve deploying weapons in space.”

    The Russian embassy did not respond to requests for comment about the allegedly threatening maneuvers by its satellites. The Kremlin has previously stated they are not weapons, but rather “inspector” spacecraft engaged in an “experiment.”

    U.S. military analysts first noticed something peculiar after Russia launched its spacecraft into orbit November 26 from Plesetsk Cosmodrome aboard a Soyuz rocket. The Russian satellite had been in orbit less than two weeks when, bafflingly, it split in two. As the analysts looked closer, they suspected that a second smaller satellite was somehow “birthed” from the first one. “The way I picture it, in my mind, is like Russian nesting dolls,” Raymond says. “The second satellite came out of the first satellite.”

    The maneuver was later confirmed on Dec. 6 when the TASS news agency cited Russia’s Defense Ministry saying the two had separated. “The purpose of the experiment is to continue work on assessing the technical condition of domestic satellites,” the statement said.

    However, the satellites, identified as Cosmos 2542 and Cosmos 2543, appeared to be carrying out another mission. By mid-January, they were sidling near the American satellite, identified as USA 245, known to space experts as a KH-11.

    The U.S. satellite, part of a reconnaissance constellation codenamed Keyhole/CRYSTAL, is operated by the National Reconnaissance Office (NRO), the secretive intelligence agency headquartered in Chantilly Va. Although the NRO refuses to comment on the large school bus-sized satellites, the KH-11’s capabilities are often compared by experts in the field to the Hubble Space Telescope. Instead of staring into the vast expanse of space, however, the satellites’ sensors and cameras are focused into the heart of foreign adversaries’ top-secret military installations

    A KH-11 satellite, known as USA 224, is widely believed by analysts to have taken the image of Iran’s Imam Khomeini Space Center that President Donald Trump posted to Twitter in August. The photo was so detailed, you could make out the Farsi characters written along the edge of the launchpad. The KH-11 constellation, which consists of four satellites that maintain constant Earth observation, operate in a polar orbit above the rotating Earth, enabling them to cover its entire surface.

    Russia’s curious space activities were first noted on Twitter last week by Michael Thompson, an amateur satellite tracker, who used publicly available data to speculate on what it was up to. “The relative orbit is actually pretty cleverly designed, where Cosmos 2542 can observe one side of the KH11 when both satellites first come into sunlight, and by the time they enter eclipse, it has migrated to the other side,” Thompson wrote in a series of tweets. “This is all circumstantial evidence, but there are a hell of a lot of circumstances that make it look like a known Russian inspection satellite is currently inspecting a known US spy satellite.”

    President Donald Trump and General John  Jay  Raymond attend a ceremony marking the establishment the U.S. Space Command at the White House on Aug. 29, 2019.
    President Donald Trump and General John "Jay" Raymond attend a ceremony marking the establishment the U.S. Space Command at the White House on Aug. 29, 2019.
    Chen Mengtong—China News Service/VCG via Getty Images

    Raymond says he’s concerned because Russia is demonstrating capabilities the U.S. first saw three years ago, when Moscow tested the “Russian nesting doll” technology. “In 2017, they launched a satellite, it launched another satellite,” he says. “The satellites exhibited characteristics of a weapon system when one of those satellites launched a high-speed projectile into space.”

    While Raymond’s allegation couldn’t be verified, the U.S. did raise the issue in 2018, warning about Russia’s “very troubling” behavior at the U.N.’s Conference on Disarmament that year without providing specifics.

    Moscow’s intent with the current mission remains unknown, but the Russian spacecraft should be capable of capturing high-resolution imagery of the American satellite as it conducts its mission, spying deep into adversaries’ territory. It’s akin to handing over a state-of-the art spy satellite to Russian scientists for forensic analysis.

    Brian Weeden, a former Air Force officer and expert in space security at the Secure World Foundation, says the Russian satellites’ positioning could allow it to determine things like where the KH-11 is “pointing—and thus what ground targets its taking picture of—as well as the general operating schedule and usage.”

    Further, if the Russian satellites are outfitted with electronic emissions probes, they could listen for radio frequency signals to try figure out how the KH-11 communicates and even attempt to intercept those communications, which are likely encrypted, says Todd Harrison, director of the Aerospace Security Project at the Center for Strategic and International Studies. “There are a lot of things it could be doing,” Harrison says. “They could simply be practicing on-orbit maneuvers or signaling to the United States that they have this capability.”

    The Keyhole program is 44 years old and the satellites are widely known to have similar capabilities as the Hubble Telescope. The U.S., China and other nations have already shown the ability to launch spacecraft into close orbit with their own satellites. The Kremlin could be showing the U.S.—in a very obvious way—that it has joined the club.

    From Raymond’s standpoint, however, maneuvering close to a foreign satellite for an “inspection” is virtually indistinguishable from staging an attack to damage, disrupt or destroy it. “It’s clear that Russia is developing on-orbit capabilities that seek to exploit our reliance on space-based systems that fuel our American way of life,” he says. Raymond wouldn’t comment specifically on Russia’s intentions with the shadowing satellites

    Over the past decade, space weaponry has gone from the stuff of science fiction to reality. A flurry of advancements from the U.S., Russia and China has altered the image of outer space as a peaceful sanctuary and instead stoked fears that an arms race has extended into the heavens.

    But even if the Russian satellites are doing the most intrusive things the Pentagon and outside observers imagine, none of them would violate treaties or international law. Absent binding agreements, the incident portends a growing a cat-and-mouse game in space. “We prefer space to remain free of conflict,” Raymond says. “We think that responsible space-faring nations need to have conversations about developing these norms going forward.”

    It is a historical truth that where humans have ventured, violence has followed. But conflict in space isn’t in any nation’s interest. There are more than 1,000 American satellites circling the planet, enabling everything from commerce, banking, transportation and communications. Russia, China and other developed nations have also grown increasingly dependent on satellites for commercial as well as military purposes, which raise the risks for miscalculation.

    The U.S. government’s space-based operations are among the most highly technical and classified secrets in its possession. Raymond’s willingness to go on the record about the ongoing event provides a glimpse into what military officials see as an increasingly congested and contested environment.

    Robert Cardillo, the former director of the U.S. National Geospatial-Intelligence Agency, says space is a “messy environment,” which without established rules, could turn into the Wild West. An attack on a satellite constellation, such as GPS, which is owned and operated by the U.S. Air Force, could have far-reaching consequences like halting ATM banking transactions or causing a blackout in navigation applications on users’ smartphones, which occurs billions of times a day around the globe.

    The developments hark back to military concept that helped keep the world safe from nuclear apocalypse during the Cold War. Mutual assured destruction (MAD)—the military doctrine that posited a nuclear strike from one nation would result in a full-scale counterattack from the other—helped prevent the U.S. and the Soviet Union from using the massive arsenals they each amassed during decades of armed standoff.

    But MAD eventually became backstopped by a series of treaties and open lines of communication designed to avoid accidental escalation of conflict. The U.S., Russia and other nations have yet to establish a similar diplomatic structure for space, and experts warn of the dangers of weaponizing the cosmos without them. “Deterrence is something we just haven’t dealt with,” in space Cardillo says. “If you make it, you can break it.”

    —With reporting by John Walcott/Washington

    WRITE TO W.J. HENNIGAN AT WILLIAM.HENNIGAN@TIME.COM.

    https://time.com/ }

    11-02-2020 om 17:26 geschreven door peter  

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    Klik hier om een link te hebben waarmee u dit artikel later terug kunt lezen.Study examines effects of nuclear war on Earth’s oceans

    Study examines effects of nuclear war on Earth’s oceans

    Researchers concluded that even a contained nuclear conflict would take a toll on Earth’s oceans and potentially disrupt the human food web. “The impacts are huge,” a scientist said.

    Turbulent top of a mushroom cloud, orange, and in an orange sky.

    A mushroom cloud erupts during the Castle Bravo nuclear weapon test at Bikini Atoll in 1954.

    Image via U.S. Department of Energy/ University of Colorado Boulder.

    You’ve likely heard of nuclear winter, a hypothesis explored by decades of scientific research. It’s the idea that – following the firestorms produced in an all-out nuclear war – the soot lifted into Earth’s stratosphere would cause serious cooling, and subsequent crop failures and famines. Now a new study has looked at how even a relatively contained nuclear conflict – for example, a hypothetical war between India and Pakistan – might shift the chemistry of Earth’s oceans. The reasoning is reminiscent of that behind nuclear winter: soot lifted into the atmosphere would cause cooling. In the new study, the researchers concluded that even a contained conflict would “take a toll” on the oceans and potentially disrupt the human food web.

    Nicole Lovenduski of University of Colorado Boulder (CU Boulder) led the study. She commented in a statement:

    The impacts are huge.

    The journal Geophysical Research Letters published the new study in late January 2020.

    These researchers used global climate models to conduct their simulations. They looked at four possible nuclear conflicts, including three in India/Pakistan of differing magnitudes (5 teragrams, 27 teragrams, and 47 teragrams of soot produced, respectively; a teragram is equal to one trillion grams or 1,000 kilotons), and one all-out U.S./Russia case with 150 teragrams of soot produced. Writing at LaboratoryEquipment.com, Michelle Taylor penned a succinct explanation of what would happen in even the “tamest” of the India-Pakistan simulations. She wrote:

    … the researchers found that the conflict would likely generate huge amounts of black carbon high in Earth’s atmosphere, causing the globe to cool. Interestingly, the researchers found that the fallout from a nuclear detonation would come in two stages: the first within one year, and the second between three and five years post-bombing.

    Soon after denotation and no longer than one year later, global climate models showed the acidity of the world’s oceans would likely dip. Years later, the world’s salt water would begin to suck up more carbon dioxide from the air. Supplies of carbonate in the oceans would shrink, removing the key ingredient that corals use to maintain their reefs and oysters use to sustain their shells.

    Lovenduski told Taylor that – beyond taking a toll on crustaceans – a major disruption of the oceanic food web would undoubtedly severely impact the human food chain. Taylor wrote:

    That’s because there are more than 3 billion people in the world today who depend on ocean fisheries for protein and/or income.

    Eight photos of a spiral shell from whole and healthy to nearly gone.

    The shell of an ocean pterapod dissolves when exposed to acidic conditions in a lab.

    Image via NOAA/ CU Boulder.

    Brian Toon, also of CU Boulder, was a co-author on the study. He commented in the team’s statement:

    This result is one that no one expected. In fact, few people have previously considered the impact of a nuclear conflict on the ocean.

    Lovenduski commented:

    A lot of things would change in the oceans once you dim the lights [via soot in the atmosphere]. The way the water moves in the ocean, for example, is sensitive to how much heat it gets from the atmosphere …

    It makes me question whether organisms could adapt to such a change. We’re already questioning whether they can adapt to the relatively slower process of man-made ocean acidification, and this would happen much more abruptly.

    Lovenduski said it’s too soon to say for sure what the fate of shelled creatures in the oceans would be if nuclear war broke out. She said she hopes that her group’s findings will bring more attention to the wide-ranging devastation that would follow even a limited nuclear exchange. There’s no such thing, she said, as a minor nuclear war, adding:

    I hope this study helps us to gain perspective on the fact that even a small-scale nuclear war could have global ramifications.

    A beach scene, looking seaward at a huge mushroom-like cloud.

    A U.S. Army nuclear test at Bikini Atoll, Micronesia, on July 25, 1946. The wider, exterior cloud is a condensation cloud, not a classic mushroom cloud. Read more about this image. A new study shows that even a limited nuclear conflict could have damaging effects on Earth’s oceans. The bombs would not have to explode over the ocean for the effects to take place.

    Image via Wikimedia Commons.

    https://earthsky.org/ }

    11-02-2020 om 01:35 geschreven door peter  

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    08-02-2020
    Klik hier om een link te hebben waarmee u dit artikel later terug kunt lezen.Chernobyl shocker as fungi that eats radiation found inside nuclear reactor

    Chernobyl shocker as fungi that eats radiation found inside nuclear reactor

    08-02-2020 om 18:54 geschreven door peter  

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    Klik hier om een link te hebben waarmee u dit artikel later terug kunt lezen.A Bizarre History of Perpetual Motion Machines

    Afficher l’image source

    A Bizarre History of Perpetual Motion Machines

    The concept of what has become known as “perpetual motion” is simple at its core. It basically describes an object or body that remains in continuous motion forever without any external energy source. If a machine were to be built using some sort of perpetual motion technology, it would theoretically run forever without any needs of fuel, batteries, or power of any kind. This means basically unlimited energy, freeing us from the tethers of finite sources of fuel and giving us devices that will never wind down or die out. It has become a sort of holy grail for certain individuals, who continue to plug away at this seemingly unobtainable dream, and it is just how amazing how much the idea of perpetual motion has enthralled people over a large portion of history.

    Such an invention would be groundbreaking, completely changing our world, and it is a fascinating thing to think about it, yet according to our current knowledge of physics it just simply isn’t possible, as such a machine would violate one or more of the laws of thermodynamics. To put it in simple terms, the First Law of Thermodynamics basically is about the conservation of energy, and says that energy cannot be created or destroyed, only transformed from one form to another, making the idea of a machine constantly creating its own energy without any outside influence impossible. There is also the Second Law of Thermodynamics, which in simple terms more or less says that an isolated system will always move toward a state of disorder, for instance heat will always dissipate and energy will be lost on any number of variables, including moving parts, friction, even sound, with the more energy formed meaning the more energy wasted. It is all much more complicated than this very basic explanation, but the gist is, a perpetual motion machine is impossible according to our current understanding of the universe and the laws of the conversation of energy. That is not to say that people haven’t tried, though.

    Efforts to come up with a real life perpetual motion machine have been going on since way back into history. One of the first examples was built in the 12th century by Indian author and medieval mathematician Bhaskara, which was an off-balanced wheel that would supposedly keep spinning indefinitely through use of a system of containers of mercury on its rim that created imbalances that theoretically would keep bringing the wheel back around again and again for eternity. It didn’t really work, but it did display the ingenuity some were willing to produce in order to figure this conundrum out. Over the centuries there would come a stream of supposed designs, with various contraptions seeking to produce perpetual motion, including windmills, self-filling flasks, float belts, magnets, pulleys, gears, wheels, and many others, all equally impossible due to what we now know about physics, and none were ever successful, true perpetual motion machines, causing scientist Henry Dircks, author of Perpetuum Mobile: Or, A History of the Search for Self-motive in 1861 to lament:

    There is something lamentable, degrading, and almost insane in pursuing the visionary schemes of past ages with dogged determination, in paths of learning which have been investigated by superior minds, and with which such adventurous persons are totally unacquainted. The history of Perpetual Motion is a history of the fool-hardiness of either half-learned, or totally ignorant persons.

    However, the idea of perpetual motion is so alluring that even well into more modern times these machines have been proposed, physics be damned. Some of these proposed devices have even managed to create quite a bit of excitement in their time. One of the most infamous of these was first unveiled in 1812 by an until then rather unknown man named Charles Redheffer, who exhibited it in his home in Philadelphia, in the United States. His fantastical machine featured a gravity-driven pendulum with a large horizontal gear on the bottom, and a smaller gear that interlocked with the larger one, with the large gear and the shaft able to rotate independently. On the gear were two ramps that held weights, and it all supposedly worked by these weights pushing the large gear away from the shaft, which would create friction that would cause the shaft and gear to spin. This spinning gear would then power the interlocked smaller gear, and on and on it would go, supposedly forever unless the weights were removed.

    Diagram of Redheffer’s machine

    The machine was put on display and immediately became a smash sensation, drawing in droves of amazed spectators and scientists alike, all of whom were charged a hefty admission fee by Redheffer and none of who could figure out how it all worked. It was largely whispered that he had finally cracked perpetual motion, that he had achieved the seemingly impossible dream. Before long Redhefer was getting quite rich off of his oddball machine, and there was much excited speculation that he had actually done it and achieved true perpetual motion, despite raised eyebrows from the scientific community. Redheffer, emboldened by the response to his device, actually requested funding from the state of Pennsylvania to build a much larger version, and on January 21, 1813, state inspectors were sent to take a look at the machine before any money would be paid. Unfortunately for Redheffer, he had never let anyone ever take a good, close at his device, and it would soon become apparent why.

    The inspectors arrived and were immediately suspicious when it turned out they could only view it through a window into a locked room. Even so, there were cracks appearing in Redheffer’s claims when it was noticed that the gear cogs were worn down in such a way as to suggest that the weights, shaft, and large gear were not powering the smaller gear, as Redheffer claimed, but rather the other way around. To them this was an obvious hoax, but the way they dealt with it is rather amusing. Rather than call out Redheffer on his scam, inspector Nathan Sellers hired a local engineer by the name of Isaiah Lukens to build a replica that was more compact and set within a solid baseboard with a square piece of glass at the top. There was no discernible way as to why it could work, yet concealed within the machine was a wind able motor that was wound through the covert use of a wooden decorative finial. With a little sleight of hand, the illusion was nearly perfect, and when he saw it Redheffer himself was so incredibly surprised to see what he took to be a real perpetual motion machine that he allegedly secretly offered Lukens a large amount of money to know the secret. After this, the news did the rest of the work and Redheffer was undone and exposed through a taste of his own medicine.

    Amazingly, this did not put a stop to Redheffer. Undeterred, he simply moved to New York to set up shop there where his reputation hadn’t been as tarnished, once again enjoying some amount a fame and drawing in droves of curiosity seekers. One of these was an engineer by the name of Robert Fulton, who noticed something fishy as he observed the mysterious device in action. He could see a slight wobble to it, and also noticed a very slight unevenness to its speed and the sounds it made, both things that should not be present in a real perpetual motion device. A real device of this type would need to be frictionless and perfectly silent because friction and sound would be a loss of energy, so these were glaring clues that something was off, especially to his trained eye. Realizing that it was obviously being somehow powered by crank motion, Fulton confronted Redheffer on the spot, but the inventor amazingly held his ground, insisting that the machine was real.

    Fulton then challenged Redheffer to allow him to search for any possible source of outside power, to which Redheffer foolishly agreed. After this, Fulton simply tore out a section of wall in full view of a gathered audience to find a concealed cable that led to an upstairs room, where an old man was found operating a crank. The spectators, who had all paid good money to see the amazing “perpetual motion machine,” were less than thrilled. They reportedly immediately took out their frustrations on the machine itself, smashing it to pieces, and might have done the same to Redheffer if he hadn’t already hi-tailed it out of there to later skip town. Unbelievably, Redheffer would claim several years later that he had created another machine, and that it was totally, for sure real this time, and he even got a patent for it in 1920, but since it was never put on display or examined and the patent was lost in a fire who knows if there was any truth to it.

    Another notable perpetual motion machine was unveiled in 1979 by American inventor Joseph Newman. The machine was called the DC motor, and according to him worked by using “energy in a magnetic field consisting of matter in motion,” and which he claimed could produce more energy than was put into it. He even went about seeking a patent for his invention, but it was denied as the Patent Office could not see how it could feasibly work. When Newman appealed this decision, it was found in an investigation by the National Bureau of Standards that the device’s power output was never above 100% of the power supplied to it, which was not promising. Newman would continue to adamantly insist that his machine really worked, but he sort of fell into obscurity after making all manner of other crackpot claims over the years. Whether his supposed perpetual motion machine ever really worked or not remains unknown, but everything we know about science says probably not.

    Interestingly, the United States Patent and Trademark Office gets a steady stream of proposals for perpetual motion machines even today, to the point where the whole patent system was changed because of it. Whereas previously a working model of an invention was not required, only that an examiner believe the concept could work or saw no reason why it shouldn’t, the USPTO Manual of Patent Examining Practice has been changed to refuse perpetual motion machine patents that do not have a physical prototype that can be examined. The United Kingdom Patent Office also has a policy against perpetual motion machines, stating “Processes or articles alleged to operate in a manner which is clearly contrary to well-established physical laws, such as perpetual motion machines, are regarded as not having industrial application.”

    The reality of perpetual motion seems to be beyond us, and these patent offices realize this, yet people keep on trying, with new designs put out all of the time and not a single one of them that has been shown to actually work without some sort of trickery. The universe seems to be dead set on never allowing it to happen, so why do they keep trying? There are likely several factors. One is that the idea is so irresistible that for many it seems that it is worth pursuing no matter what the obstacles. Another is probably that for some it seems like a challenge, a way to break through long held paradigms like the revolutionary explorers, inventors and scientists of the past. After all many of the facts and laws of the universe that we take for granted now were once equally scoffed at and in some cases might as well have been magic. For these people there is a chance, no matter how small, that a way can be found to make perpetual motion work despite the physical limitations. On top of all of this is the unfortunate possibility that many of these would-be inventors simply don’t grasp the established impossibility of it all, and one Donald Simanek, a former physics professor at Lock Haven University of Pennsylvania, has offered his opinion on why people keep trying perpetual motion in an interview with Live Science:

    My hunch is that they are motivated by their incomplete understanding of physics. The perpetual motion machine inventors’ view of physics is a collection of unrelated equations for specific purposes. They fail to grasp the greatest strength of physics — its logical unity. For example, the laws of thermodynamics do not arise by fiat. They are derivable from Newton’s laws and the kinetic model of gases and have been well-tested experimentally … You can’t simply discard one law you ‘don’t like’ without bringing the whole logical structure of physics crashing down. 

    Could there be some place where the geometry (and the physics) are different? Maybe, but we have no clue where to find that place, and one might wonder whether we could even go there, or exploit it for our purposes. That’s armchair speculation, and science-fiction, not science.

    For now, the notion of a real working perpetual motion machine really does sit in the realm of science fiction, and it has mostly been a pursuit abandoned by most real scientists. It has come to be relegated to mad inventors working in their garages against all odds to try and make the impossible possible. There is little chance that there will ever be a practical solution to the physical hurdles in the way of achieving perpetual motion, but just as many have tried throughout history there are surely those who will still keep on trying. Whether it will ever gain any credence or results remains to be seen.

    https://mysteriousuniverse.org/ }

    08-02-2020 om 00:25 geschreven door peter  

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    Categorie:Diversen (Eng, NL en Fr)
    05-02-2020
    Klik hier om een link te hebben waarmee u dit artikel later terug kunt lezen.Ancient Worldwide Flood Evidence That Will Challenge the Way You View Human History

    Ancient Worldwide Flood Evidence That Will Challenge the Way You View Human History

    What if the ancient tales of a worldwide flood were true? Since the late 1800’s, geologists hold firm that the geological records show no indication of a deluge affecting the entire planet. Michael Jaye brings forward the evidence he has collected, which he believes proves the differ.
     
    He states that the landscape of ancient Earth was vastly different from what it is today and was obliterated by a massive cosmic event which increased the world’s water by more than 90%.

    Michael Jaye, Ph.D., recently retired as an associate professor at the Naval Postgraduate School in Monterey, CA. He previously spent fifteen years teaching mathematics and its applications at West Point, NY. His interest in the worldwide flood began with Google Map images of the Monterey Canyon system.

    Other videos -- peter2011

    05-02-2020 om 23:04 geschreven door peter  

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    04-02-2020
    Klik hier om een link te hebben waarmee u dit artikel later terug kunt lezen.Gigantic Totten glacier in Antarctica is 'melting from beneath' and could cause sea levels to rise 11 FEET

    Gigantic Totten glacier in Antarctica is 'melting from beneath' and could cause sea levels to rise 11 FEET

    • New study found that East Antarctica’s largest glacier is melting from beneath
    • This happens as strong winds over Southern Ocean allow warm water to rise
    • Winds are expected to intensify with climate change, causing further melting

    With the potential to cause sea levels to rise by more than 11 feet and unleash the ice of the East Antarctic Ice Sheet, the massive Totten Glacier has come to be known as the ‘sleeping giant.’

    And now, scientists have discovered that strong winds over the Southern Ocean could be causing it to wake up.

    A new study has found that East Antarctica’s largest glacier is melting from beneath, as winds transport warm water to the ice – and, these winds are expected to intensify with climate change, the experts warn.

    Scroll down for video 

    The research revealed that the glacier’s flow speeds up when winds over the Southern Ocean are strong. These winds pull warm water up from the deep ocean, in a process known as upwelling

    The research revealed that the glacier’s flow speeds up when winds over the Southern Ocean are strong.These winds pull warm water up from the deep ocean, in a process known as upwelling.

    EAST ANTARCTICA MORE STABLE THAN THE WEST

    A recent study conducted by researchers based at Indiana University-Purdue University Indianapolis has found that the central core of the East Antarctic ice sheet should remain stable even if the West Antarctic ice sheet melts.

    The West Antarctic ice sheet is a marine-based ice sheet that is mostly grounded below sea level, which makes it much more susceptible to changes in sea level and variations in ocean temperature than the East Antarctic Ice Sheet.

    By contrast the East Antarctic ice sheet has been considered relatively stable because most of the ice sheet was though to rest on bedrock above sea level, making it less susceptible to changes in climate.

    In the study, led by researchers at the University of Texas at Austin, used satellite images and wind stress data to investigate the effect of wind on the water beneath the glacier.

    While the glacier is known to speed up some years, it also slows down in others.

    The research revealed that the glacier’s flow speeds up when winds over the Southern Ocean are strong.

    These winds pull warm water up from the deep ocean, in a process known as upwelling.

    The warm water climbs to the continental shelf – and, once it reaches the coast, it circulates beneath a floating chunk of the glacier, and causes the ice sheet to melt from below, according to the researchers.

    ‘Totten has been called the sleeping giant because it’s huge and has been seen as insensitive to changes in its environment,’ said lead author Chad Greene, a PhD candidate at the University of Texas Institute for Geophysics (UTIG).

    ‘But we’ve shown that if Totten is asleep, it’s certainly not in a coma – we’re seeing signs of responsiveness, and it might just take the wind blowing to wake it up.’

    Wind strength varies from year to year, the researchers explain.

    But, climate change is expected to intensify the winds over the Southern Ocean, which could, in turn, effect the melting of the Totten Glacier.

    The process does not require the air or ocean temperatures to rise – instead, upwelling occurs as the wind displaces the surface water, making way for the deeper, warmer water.

    ‘It’s like when you blow across a hot bowl of soup and little bits of noodles from the bottom begin to swirl around and rise to the top,’ said Greene.

    The new study follows up on previous research led by a team with the Australian Antarctic Division at the Antarctic Climate & Ecosystems Cooperative Research Center.

    That research found that the warm water below Totten causes the glacier to detach from the seafloor, and instead float.

    This can cause the flow to further accelerate.

    The Totten Glacier is one of the fastest-flowing and largest glaciers in Antarctica with scientists keen to keep a close eye on how it melts given the enormous amount of water it could potentially unleash

    With the potential to cause sea levels to rise by more than 11 feet and unleash the ice of the East Antarctic Ice Sheet, the massive Totten Glacier has come to be known as the ‘sleeping giant’

    ‘The remaining question was, why do the canyons beneath Totten get flushed with warm water some years and cold water other years,’ said Jason Roberts, a glaciologist who led the earlier study.

    The findings suggest melting at Totten could become more extreme as winds grow stronger with climate change.

    ‘Ice sheet sensitivity to wind forcing has been hypothesized for a long time, but it takes decades of observation to show unequivocal cause and effect,’ said Donald Blankenship, a senior researcher at UTIG who contributed to this study and Roberts’ study.

    ‘Now we’re at the point where we can explicitly show the links between what happens in the atmosphere, what happens in the ocean, and what happens to the Antarctic Ice Sheet.’ 

    https://www.dailymail.co.uk/ }

    04-02-2020 om 23:56 geschreven door peter  

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