Dit is ons nieuw hondje Kira, een kruising van een waterhond en een Podenko. Ze is sinds 7 februari 2024 bij ons en druk bezig ons hart te veroveren. Het is een lief, aanhankelijk hondje, dat zich op een week snel aan ons heeft aangepast. Ze is heel vinnig en nieuwsgierig, een heel ander hondje dan Noleke.
This is our new dog Kira, a cross between a water dog and a Podenko. She has been with us since February 7, 2024 and is busy winning our hearts. She is a sweet, affectionate dog who quickly adapted to us within a week. She is very quick and curious, a very different dog than Noleke.
DEAR VISITOR,
MY BLOG EXISTS ALREADY 13 YEARS AND 2 MONTH.
ON 06/08/2024 MORE THAN 2.161.100
VISITORS FROM 135 DIFFERENT NATIONS ALREADY FOUND THEIR WAY TO MY BLOG.
THAT IS AN AVERAGE OF 400GUESTS PER DAY.
THANK YOU FOR VISITING MY BLOG AND HOPE YOU ENJOY EACH TIME.
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. Each author stays resposable for the continue of his articles. As blogmaster I have the right to refuse an addition or an article, when it attacks other collegues or UFO-groupes.
Druk op onderstaande knop om te reageren in mijn forum
Zoeken in blog
Deze blog is opgedragen aan mijn overleden echtgenote Lucienne.
In 2012 verloor ze haar moedige strijd tegen kanker!
In 2011 startte ik deze blog, omdat ik niet mocht stoppen met mijn UFO-onderzoek.
BEDANKT!!!
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 In België had je vooral BUFON of het Belgisch UFO-Netwerk, dat zich met UFO's bezighoudt. BEZOEK DUS ZEKER VOOR ALLE OBJECTIEVE INFORMATIE , enkel nog beschikbaar via Facebook en deze blog.
Verder heb je ook het Belgisch-Ufo-meldpunt en Caelestia, die prachtig, doch ZEER kritisch werk leveren, ja soms zelfs héél sceptisch...
Voor Nederland kan je de mooie site www.ufowijzer.nl bezoeken van Paul Harmans. Een mooie site met veel informatie en artikels.
MUFON of het Mutual UFO Network Inc is een Amerikaanse UFO-vereniging met afdelingen in alle USA-staten en diverse landen.
MUFON's mission is the analytical and scientific investigation of the UFO- Phenomenon for the benefit of humanity...
Je kan ook hun site bekijken onder www.mufon.com.
Ze geven een maandelijks tijdschrift uit, namelijk The MUFON UFO-Journal.
Since 02/01/2020 is Pieter ex-president (=voorzitter) of BUFON, but also ex-National Director MUFON / Flanders and the Netherlands. We work together with the French MUFON Reseau MUFON/EUROP.
ER IS EEN NIEUWE GROEPERING DIE ZICH BUFON NOEMT, MAAR DIE HEBBEN NIETS MET ONZE GROEP TE MAKEN. DEZE COLLEGA'S GEBRUIKEN DE NAAM BUFON VOOR HUN SITE... Ik wens hen veel succes met de verdere uitbouw van hun groep. Zij kunnen de naam BUFON wel geregistreerd hebben, maar het rijke verleden van BUFON kunnen ze niet wegnemen...
01-12-2017
Er was helemaal geen oerknal. Braziliaanse wetenschapper zet kosmologie op zijn kop
Er was helemaal geen oerknal. Braziliaanse wetenschapper zet kosmologie op zijn kop
Algemeen wordt aangenomen dat het universum is ontstaan na de Big Bang of oerknal. De Braziliaanse natuurkundige Juliano Cesar Silva heeft daar zo zijn bedenkingen bij.
Volgens hem is er geen oerknal geweest. In het tijdschrift General Relativity and Gravitation stelt Neves dat het universum op een cyclische manier uitdijt en samentrekt.
Hij denkt aan een cyclische versie van het heelal, zo zegt hij in gesprek met Sputnik Brasil. “Mijn kosmologische model houdt rekening met de expansie van het universum en andere bekende fenomenen zoals kosmische straling.”
Grootste onopgeloste problemen
“Het belangrijkste probleem is de Big Bang en het punt met een bijna oneindig grote dichtheid, de singulariteit,” vervolgt hij.
Het begrijpen van de vroegste fasen in de geschiedenis van het universum is momenteel één van de grootste onopgeloste problemen in de natuurkunde.
Wetenschappers denken dit probleem in de toekomst op te kunnen lossen met de hulp van de kwantumgravitatie, een theorie die de kwantummechanica en relativiteitstheorie met elkaar verenigt, maar nog niet bestaat.
Soms heb je situaties waarin je deze twee theorieën wel moet combineren, bijvoorbeeld vlak na de oerknal toen alle massa samengepakt zat in een hele kleine ruimte.
Kapot
Maar ook wanneer je naar onvoorstelbaar kleine afstanden gaat kijken, moet je beide combineren. Op de zogenoemde Planckschaal kun je niet meer één van de twee theorieën los gebruiken.
Op de meest fundamentele schaal, het kleinste van het kleinste, is de kwantummechanica óf relativiteit niet meer toereikend.
Die twee spreken elkaar gigantisch tegen en de natuurkunde gaat daar kapot.
Op de Planckschaal geldt de kwantum-zwaartekrachtstheorie. Maar die is nog altijd niet experimenteel bevestigd.
Cyclisch model
Volgens Neves kan dit probleem worden opgelost zonder kwantumtheorieën te gebruiken. In zijn model is er geen beginpunt.
De natuurkundige zegt dat er geen explosie of knal was, maar stelt een model voor waarin het heelal terugveert.
“Als dat zo blijkt te zijn, was er nog een andere fase voordat het universum begon uit te dijen,” zegt hij. “Als het momenteel uitdijt, moet het hiervoor zijn samengetrokken.”
Op basis hiervan kan een cyclisch model worden gemaakt waarin het universum steeds samentrekt en uitdijt, licht Neves toe.
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- Gemiddelde waardering: 0/5 - (0 Stemmen) Categorie:News from the FRIENDS of facebook ( ENG )
Er was helemaal geen oerknal. Braziliaanse wetenschapper zet kosmologie op zijn kop
Er was helemaal geen oerknal. Braziliaanse wetenschapper zet kosmologie op zijn kop
Algemeen wordt aangenomen dat het universum is ontstaan na de Big Bang of oerknal. De Braziliaanse natuurkundige Juliano Cesar Silva heeft daar zo zijn bedenkingen bij.
Volgens hem is er geen oerknal geweest. In het tijdschrift General Relativity and Gravitation stelt Neves dat het universum op een cyclische manier uitdijt en samentrekt.
Hij denkt aan een cyclische versie van het heelal, zo zegt hij in gesprek met Sputnik Brasil. “Mijn kosmologische model houdt rekening met de expansie van het universum en andere bekende fenomenen zoals kosmische straling.”
Grootste onopgeloste problemen
“Het belangrijkste probleem is de Big Bang en het punt met een bijna oneindig grote dichtheid, de singulariteit,” vervolgt hij.
Het begrijpen van de vroegste fasen in de geschiedenis van het universum is momenteel één van de grootste onopgeloste problemen in de natuurkunde.
Wetenschappers denken dit probleem in de toekomst op te kunnen lossen met de hulp van de kwantumgravitatie, een theorie die de kwantummechanica en relativiteitstheorie met elkaar verenigt, maar nog niet bestaat.
Soms heb je situaties waarin je deze twee theorieën wel moet combineren, bijvoorbeeld vlak na de oerknal toen alle massa samengepakt zat in een hele kleine ruimte.
Kapot
Maar ook wanneer je naar onvoorstelbaar kleine afstanden gaat kijken, moet je beide combineren. Op de zogenoemde Planckschaal kun je niet meer één van de twee theorieën los gebruiken.
Op de meest fundamentele schaal, het kleinste van het kleinste, is de kwantummechanica óf relativiteit niet meer toereikend.
Die twee spreken elkaar gigantisch tegen en de natuurkunde gaat daar kapot.
Op de Planckschaal geldt de kwantum-zwaartekrachtstheorie. Maar die is nog altijd niet experimenteel bevestigd.
Cyclisch model
Volgens Neves kan dit probleem worden opgelost zonder kwantumtheorieën te gebruiken. In zijn model is er geen beginpunt.
De natuurkundige zegt dat er geen explosie of knal was, maar stelt een model voor waarin het heelal terugveert.
“Als dat zo blijkt te zijn, was er nog een andere fase voordat het universum begon uit te dijen,” zegt hij. “Als het momenteel uitdijt, moet het hiervoor zijn samengetrokken.”
Op basis hiervan kan een cyclisch model worden gemaakt waarin het universum steeds samentrekt en uitdijt, licht Neves toe.
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- Gemiddelde waardering: 0/5 - (0 Stemmen) Categorie:News from the FRIENDS of facebook ( ENG )
Jekaterinburg: Bewohner melden Ufo-Absturz am Flughafen – VIDEOs
Jekaterinburg: Bewohner melden Ufo-Absturz am Flughafen – VIDEOs
In der Ural-Stadt Jekaterinburg breiten sich am Montag Gerüchte über den Absturz eines unidentifizierten Flugobjekts (Ufo) aus. Amateurvideos zeigen einen Feuerball, der über den Himmel rast und dann niedergeht. Die Behörden haben den Vorfall vorerst nicht bestätigt.
In den sozialen Netzwerken spricht sich herum, dass im Raum des Flughafens Jekaterinburg Kolzowo möglicherweise ein Meteorit eingeschlagen sei.
Der regionale Katastrophenschutz teilte auf eine Sputnik-Nachfrage mit, in der Stadt seien keinerlei Vorfälle registriert worden.
Auch der Flughafen arbeitet nach eigenen Angaben ohne Beeinträchtigung.
Anfang 2013 war über dem Ural ein Meteorit mit einem geschätzten Durchmesser von 19 Metern in die Erdatmosphäre eingetreten und explodiert. Durch die Druckwelle und zersplitterndes Fensterglas wurden in mehreren Regionen mehr als 1500 Menschen verletzt. Der über den Horizont rasende Himmelskörper wurde von zahlreichen Zeugen gefilmt. Seine Splitter fielen wie Feuerbälle auf die Erde und richteten beträchtliche Schäden an. Am schlimmsten betroffen war das Gebiet Tscheljabinsk, nach dem der Himmelskörper schließlich benannt wurde.
Inwoners Russische stad in de ban van oplichtend object. Bekijk hier de beelden
Inwoners Russische stad in de ban van oplichtend object. Bekijk hier de beelden
Inwoners van de stad Jekaterinenburg in de Oeral hebben maandag een grote lichtbol gezien in de lucht. In filmpjes is een vuurbal te zien aan de hemel, meldt persbureau Sputnik.
Verschillende inwoners van de stad twitterden maandagochtend dat een ongeïdentificeerd oplichtend object was neergekomen aan de zuidelijke rand van de stad.
Het Russische ministerie van Noodgevallen vertelde aan persbureau RIA Novosti dat er geen meldingen over het incident waren binnengekomen.
Meteoriet
Een woordvoerder van vliegveld Koltsovo zei alleen tegen het persagentschap dat de luchthaven normaal functioneert.
Op sociale media wordt gezegd dat in de omgeving van het vliegveld mogelijk een meteoriet is ingeslagen.
19 meter
In 2013 explodeerde in de Oeral een meteoriet met een doorsnee van 19 meter in de atmosfeer. De schokgolf die daarbij ontstond deed veel ramen springen. Meer dan 1500 mensen raakten toen gewond.
De meteoriet werd door talrijke getuigen gefilmd. De explosie van de vuurbal richtte aanzienlijke schade aan.
Bekijk hieronder enkele video’s van de vuurbal in de lucht boven Siberië:
Dit jaar zijn mensen op diverse plaatsen ter wereld opgeschrikt door series aardbevingen waarvan wetenschappers zeggen dat ze de voorbode zijn van nog veel grotere.
Zo was er dit jaar een record aantal aardbevingen rondom Yellowstone en nu weer Californië, terwijl Nieuw Zeeland groot gevaar loopt te worden verwoest door een megabeving.
Er doet zich een trend voor, wereldwijd, die eenieder aan het denken zou moeten zetten. Die is dat er steeds meer tekenen zijn die erop wijzen dat er grote krachten op de aarde worden uitgeoefend.
Zoals gewoonlijk worden er geen verbanden gelegd en kijkt men naar iedere gebeurtenis afzonderlijk en vraagt zich af hoe dit kan. Zoals nu weer in de Amerikaanse staat Californië.
Volgens de meest recente cijfers hebben zich daar in 30 dagen tijd maar liefst 698 aardbevingen voorgedaan. Wetenschappers zeggen altijd dat wanneer seismische activiteit in een bepaald gebied uit de hand begint te lopen er een groeiende kans is dat er zich een zware aardbeving zal voor doen. De mainstream media staan de laatste tijd bol van de series kleine aardbevingen die voorkomen in Californië en toen er zich eerder deze maand een 4.6 beving voor deed in Monterey County werd dit dan ook onmiddellijk wereldnieuws.
Het hele jaar door doen zich in dat gebied al kleinere aardbevingen voor, zoals we bijvoorbeeld schreven in juni dit jaar:
Feit is ook dat ook Californië is getroffen door een serie aardbevingen. Het gebied in de buurt van de stad Truckee, enkele honderden kilometers ten noordoosten van San Francisco, werd getroffen door een serie van 16 aardbevingen, waarbij inwoners zich angstig afvroegen of de tijd voor The Big One was gekomen. De zwaarste van de serie was 3.9 op de schaal van Richter en ook hier allerlei geruststellende woorden.
Wanneer je kijkt naar de recente serie aardbevingen en je kijkt op de volgende afbeelding naar hoe de zogenaamde St. Andreas breuklijn loopt, dan besef hoe kwetsbaar Californië is voor The Big One, de allesvernietigende aardbeving, waarvan wetenschappers denken dat deze nu snel naderbij komt.
En hoewel het voorspellen van aardbevingen altijd riskant is, denken wetenschappers nu toch dat de kans op deze Big One toeneemt. De laatste keer dat dit gebied werd getroffen door een zware aardbeving was in 1857 door een beving met een kracht van 7,9 op de schaal van Richter.
Van Californië gaan we naar de andere van de wereld en wel Nieuw Zeeland waar een jaar geleden het volgende gebeurde:
Op 13 november 2016 vond op 15 km afstand van Culverden op het Zuidereiland van Nieuw-Zeeland een aardbeving met een kracht van 7,8 op de schaal van Richter plaats. Na de aardbeving werd voor de hele oostkust van Nieuw-Zeeland een tsunamiwaarschuwing afgegeven.
Deze aardbeving heeft een breuklijn waarvan men dacht dat deze "slapend" was, wakker gemaakt. Er wordt nu rond deze breuklijn nieuwe activiteit waargenomen en dit betekent dat Nieuw Zeeland de kans loopt verwoest te worden door een enorme beving van rond 9.0 op de schaal van Richter.
Het probleem ontstaat door de bewegingen van twee tektonische platen, de Australische en de Pacific. De eerste beweegt naar het noorden, de tweede naar het westen en dit kan een enorme aardbeving veroorzaken op de bodem van de oceaan met bijbehorende tsunami. Een beving vergelijkbaar met die in Japan, waar 11.000 mensen om het leven kwamen en waarvan de wereld nog steeds te maken heeft met de gevolgen, de ramp met de kerncentrales in Fukushima.
Zoals wij iedere keer schrijven zijn het geen geïsoleerde voorvallen. De heftige aardveranderingen worden veroorzaakt doordat er voor ons onbekende krachten inwerken op de aarde. Krachten die zorgen voor weer extremen, record aantal aardbevingen en vulkanen die overal ter wereld ongekend actief worden.
Wanneer er voor één keer een avondvullend televisieprogramma gemaakt zou worden met alle heftige aardverandering in één jaar tijd op een rij, dan zou niemand meer een oog dicht doen en ervan overtuigd zijn dat er een externe kracht aan het werk is. Maar, dat gebeurt niet en dus wordt er bericht over iedere gebeurtenis afzonderlijk en slaapt iedereen verder.
Hoe heftig die aardbeving vorig jaar was in Nieuw Zeeland kan je zien op de volgende afbeelding van een spoorlijn.
Insider Exposes The Reality Of The Alien Presence!
Insider Exposes The Reality Of The Alien Presence!
Shocking Secrets
In this historic and powerful Dark Journalist episode Host Daniel Liszt welcomes Watergate Lawyer and Author Douglas Caddy. Caddy is well-known for being the Attorney of the Watergate burglars who mysteriously broke into the Democratic National Committee (DNC) looking for secrets that have never been revealed.
CIA Insider Reveals Assassination
Caddy was close personal friends with ultra CIA insider and Super Spy agent E. Howard Hunt, who used Caddy to represent his many non-intel projects, but later lured him in to represent the Watergate burglars while keeping his own role hidden.
In their final meeting Hunt shared never before heard details of the JFK Assassination with Caddy, including the fact that the Watergate burglary was instigated as a mission to obtain vital documents regarding hidden evidence in the DNC that revealed details of a massive conspiracy to assassinate JFK.
In a bombshell twist, Hunt then revealed that JFK was killed for his attempts to expose the reality of the Alien Presence and share it with our Russian Cold War adversaries.
Sharing The UFO File
Since the original UFO flap of 1947, the US had created a secret group sometimes referred to as 'Majestic Twelve' or ‘MJ12' to study the phenomena and to reverse-engineer technology that was recovered.
This secret MJ12 group began to grow beyond it’s mandate and eventually slipped away from presidential supervision and formed a Breakaway group operating inside the National Security State via elements in the CIA.
When Kennedy discovered this covert group operating outside the purview of the President he instituted a number of initiatives to regain control over the advanced research and technology achieved with knowledge of the Alien Presence.
One of these initiatives was to share our knowledge of the UFO Phenomena with our Russian Cold War enemies in the Soviet Union, and institute a joint Space Program/Moon Mission to avert a new arms race in space.
JFK Memos
Documented official memos from JFK, including National Security Action Memorandum 271, direct NASA to institute a new policy of cooperation in space exploration with the Russians, another memo, recently released under the Freedom of Information Act, shows JFK told the CIA to hand over all data concerning UFOs with an emphasis on “High Threat” cases.
These memos were dated November 12th, 1963, only ten days before JFK was killed in Dallas, Texas and are further evidence that he was assassinated because of his exposing of the UFO secret.
The UFO cabal were not going to let him show the world what the National Security State decided was their own private discovery. They were willing to remove a sitting President to maintain their UFO Technology Secrecy!
Host: George Knapp Guests: Robert Salas, Robert Bartholomew
In the first half, George Knapp welcomed Air Force insider and former FAA employee, Robert Salas, who offered ample refutation to the Air Force statement: “No UFO reported, investigated and evaluated by the Air Force was ever an indication of threat to our national security.” He cited details of his March, 1967 experience with a UFO at Malmstrom AFB in Montana. During the episode, the base’s nuclear missiles were disabled, and the missile’s frightened guards reported seeing strange lights in the sky, which were silently flying at high speeds, and making unusual turns. He learned that a similar occurrence had taken place a week earlier at another base, where 10 missiles were shutdown as UFOs were seen.
Amazing UFO footage filmed over Del Mar, California 29-Nov-2017
Amazing UFO footage filmed over Del Mar, California 29-Nov-2017
Check out this interesting footage of a three unknown object making maneuvers over Del Mar in California. This happened on 29th November 2017.
Witness report:
Could be balloons, but with strong prejudice. Was very strange. At first I thought it looked like black balloons, and they did kind of move like that in the way that they ascended through the sky together. But there was also something weird about it… All three of them moved indipendintly backward, forward, and around each other. It felt strange.
All balloons I’ve seen in the sky seem to have a direct path and don’t wobble around like these did—but who knows. Just thought it was strange and wanted to send to you for your expertise.
Blowing in the stellar wind: Scientists reduce the chances of life on exoplanets in so-called habitable zones
Blowing in the stellar wind: Scientists reduce the chances of life on exoplanets in so-called habitable zones
byJohn Greenwald
Image of starlight on exoplanet, courtesy of NASA/JPL-Caltech.
Is there life beyond Earth in the cosmos? Astronomers looking for signs have found that our Milky Way galaxy teems with exoplanets, some with conditions that could be right for extraterrestrial life. Such worlds orbit stars in so-called "habitable zones," regions where planets could hold liquid water that is necessary for life as we know it.
However, the question of habitability is highly complex. Researchers led by space physicist Chuanfei Dong of the U.S. Department of Energy's (DOE) Princeton Plasma Physics Laboratory (PPPL) and Princeton University have recently raised doubts about water on—and thus potential habitability of—frequently cited exoplanets that orbit red dwarfs, the most common stars in the Milky Way.
Impact of stellar wind
In two papers in The Astrophysical Journal Letters, the scientists develop models showing that the stellar wind—the constant outpouring of charged particles that sweep out into space—could severely deplete the atmosphere of such planets over hundreds of millions of years, rendering them unable to host surface-based life as we know it.
"Traditional definition and climate models of the habitable zone consider only the surface temperature," Dong said. "But the stellar wind can significantly contribute to the long-term erosion and atmospheric loss of many exoplanets, so the climate models tell only part of the story."
To broaden the picture, the first paper looks at the timescale of atmospheric retention on Proxima Centauri b (PCb), which orbits the nearest star to our solar system, some 4 light years away. The second paper questions how long oceans could survive on "water worlds"—planets thought to have seas that could be hundreds of miles deep.
Two-fold effect
The research simulates the photo-chemical impact of starlight and the electromagnetic erosion of stellar wind on the atmosphere of the exoplanets. These effects are two-fold: The photons in starlight ionize the atoms and molecules in the atmosphere into charged particles, allowing pressure and electromagnetic forces from the stellar wind to sweep them into space. This process could cause severe atmospheric losses that would prevent the water that evaporates from exoplanets from raining back onto them, leaving the surface of the planet to dry up.
On Proxima Centauri b, the model indicates that high stellar wind pressure would cause the atmosphere to escape and prevent atmosphere from lasting long enough to give rise to surface-based life as we know it. "The evolution of life takes billions of years," Dong noted. "Our results indicate that PCb and similar exoplanets are generally not capable of supporting an atmosphere over sufficiently long timescales when the stellar wind pressure is high."
"It is only if the pressure is sufficiently low," he said, "and if the exoplanet has a reasonably strong magnetic shield like that of the Earth's magnetosphere, that the exoplanet can retain an atmosphere and has the potential for habitability."
Evolution of habitable zone
Complicating matters is the fact that the habitable zone circling red stars could evolve over time. So high stellar wind pressure early on could increase the rate of atmospheric escape. Thus, the atmosphere could have eroded too soon, even if the exoplanet was protected by a strong magnetic field like the magnetosphere surrounding Earth, Dong said. "In addition, such close-in planets could also be tidally locked like our moon, with one side always exposed to the star. The resultant weak global magnetic field and the constant bombardment of stellar wind would serve to intensify losses of atmosphere on the star-facing side."
Turning to water worlds, the researchers explored three different conditions for the stellar wind. These ranged from:
Winds that strike the Earth's magnetosphere today.
Ancient stellar winds flowing from young, Sun-like stars that were just a toddler-like 0.6 billion years old compared with the 4.6 billion year age of the Sun.
The impact on exoplanets of a massive stellar storm like the Carrington event, which knocked out telegraph service and produced auroras around the world in 1859.
The simulations illustrated that ancient stellar wind could cause the rate of atmospheric escape to be far greater than losses produced by the current solar wind that reaches the magnetosphere of Earth. Moreover, the rate of loss for Carrington-type events, which are thought to occur frequently in young Sun-like stars, was found to be greater still.
"Our analysis suggests that such space weather events may prove to be a key driver of atmospheric losses for exoplanets orbiting an active young Sun-like star," the authors write.
High probability of dried-up oceans
Given the increased activity of red stars and the close-in location of planets in habitable zones, these results indicate the high probability of dried-up surfaces on planets that orbit red stars that might once have held oceans that could give birth to life. The findings could also modify the famed Drake equation, which estimates the number of civilizations in the Milky Way, by lowering the estimate for the average number of planets per star that can support life.
Authors of the PCb paper note that predicting the habitability of planets located light years from Earth is of course filled with uncertainties. Future missions like the James Webb Space Telescope, which NASA will launch in 2019 to peer into the early history of the universe, will therefore "be essential for getting more information on stellar winds and exoplanet atmospheres," the authors say, "thereby paving the way for more accurate estimations of stellar-wind induced atmospheric losses."
Scientists spot potentially habitable worlds with regularity. Recently, a newly discovered Earth-sized planet orbiting Ross 128, a red dwarf star that is smaller and cooler than the sun located some 11 light years from Earth, was cited as a water candidate. Scientists noted that the star appears to be quiescent and well-behaved, not throwing off flares and eruptions that could undo conditions favorable to life.
Collaborating with Dong on the PCb paper were physicists from Harvard University, the Harvard-Smithsonian Center for Astrophysics, the University of California, Los Angeles, and the University of Massachusetts.
More information:Chuanfei Dong et al. Is Proxima Centauri b Habitable? A Study of Atmospheric Loss, The Astrophysical Journal (2017). DOI: 10.3847/2041-8213/aa6438 https://arxiv.org/abs/1702.04089
Chuanfei Dong et al. The Dehydration of Water Worlds via Atmospheric Losses, The Astrophysical Journal (2017). DOI: 10.3847/2041-8213/aa8a60 https://arxiv.org/abs/1709.01219
Blowing in the stellar wind: Scientists reduce the chances of life on exoplanets in so-called habitable zones
Blowing in the stellar wind: Scientists reduce the chances of life on exoplanets in so-called habitable zones
byJohn Greenwald
Image of starlight on exoplanet, courtesy of NASA/JPL-Caltech.
Is there life beyond Earth in the cosmos? Astronomers looking for signs have found that our Milky Way galaxy teems with exoplanets, some with conditions that could be right for extraterrestrial life. Such worlds orbit stars in so-called "habitable zones," regions where planets could hold liquid water that is necessary for life as we know it.
However, the question of habitability is highly complex. Researchers led by space physicist Chuanfei Dong of the U.S. Department of Energy's (DOE) Princeton Plasma Physics Laboratory (PPPL) and Princeton University have recently raised doubts about water on—and thus potential habitability of—frequently cited exoplanets that orbit red dwarfs, the most common stars in the Milky Way.
Impact of stellar wind
In two papers in The Astrophysical Journal Letters, the scientists develop models showing that the stellar wind—the constant outpouring of charged particles that sweep out into space—could severely deplete the atmosphere of such planets over hundreds of millions of years, rendering them unable to host surface-based life as we know it.
"Traditional definition and climate models of the habitable zone consider only the surface temperature," Dong said. "But the stellar wind can significantly contribute to the long-term erosion and atmospheric loss of many exoplanets, so the climate models tell only part of the story."
To broaden the picture, the first paper looks at the timescale of atmospheric retention on Proxima Centauri b (PCb), which orbits the nearest star to our solar system, some 4 light years away. The second paper questions how long oceans could survive on "water worlds"—planets thought to have seas that could be hundreds of miles deep.
Two-fold effect
The research simulates the photo-chemical impact of starlight and the electromagnetic erosion of stellar wind on the atmosphere of the exoplanets. These effects are two-fold: The photons in starlight ionize the atoms and molecules in the atmosphere into charged particles, allowing pressure and electromagnetic forces from the stellar wind to sweep them into space. This process could cause severe atmospheric losses that would prevent the water that evaporates from exoplanets from raining back onto them, leaving the surface of the planet to dry up.
On Proxima Centauri b, the model indicates that high stellar wind pressure would cause the atmosphere to escape and prevent atmosphere from lasting long enough to give rise to surface-based life as we know it. "The evolution of life takes billions of years," Dong noted. "Our results indicate that PCb and similar exoplanets are generally not capable of supporting an atmosphere over sufficiently long timescales when the stellar wind pressure is high."
"It is only if the pressure is sufficiently low," he said, "and if the exoplanet has a reasonably strong magnetic shield like that of the Earth's magnetosphere, that the exoplanet can retain an atmosphere and has the potential for habitability."
Evolution of habitable zone
Complicating matters is the fact that the habitable zone circling red stars could evolve over time. So high stellar wind pressure early on could increase the rate of atmospheric escape. Thus, the atmosphere could have eroded too soon, even if the exoplanet was protected by a strong magnetic field like the magnetosphere surrounding Earth, Dong said. "In addition, such close-in planets could also be tidally locked like our moon, with one side always exposed to the star. The resultant weak global magnetic field and the constant bombardment of stellar wind would serve to intensify losses of atmosphere on the star-facing side."
Turning to water worlds, the researchers explored three different conditions for the stellar wind. These ranged from:
Winds that strike the Earth's magnetosphere today.
Ancient stellar winds flowing from young, Sun-like stars that were just a toddler-like 0.6 billion years old compared with the 4.6 billion year age of the Sun.
The impact on exoplanets of a massive stellar storm like the Carrington event, which knocked out telegraph service and produced auroras around the world in 1859.
The simulations illustrated that ancient stellar wind could cause the rate of atmospheric escape to be far greater than losses produced by the current solar wind that reaches the magnetosphere of Earth. Moreover, the rate of loss for Carrington-type events, which are thought to occur frequently in young Sun-like stars, was found to be greater still.
"Our analysis suggests that such space weather events may prove to be a key driver of atmospheric losses for exoplanets orbiting an active young Sun-like star," the authors write.
High probability of dried-up oceans
Given the increased activity of red stars and the close-in location of planets in habitable zones, these results indicate the high probability of dried-up surfaces on planets that orbit red stars that might once have held oceans that could give birth to life. The findings could also modify the famed Drake equation, which estimates the number of civilizations in the Milky Way, by lowering the estimate for the average number of planets per star that can support life.
Authors of the PCb paper note that predicting the habitability of planets located light years from Earth is of course filled with uncertainties. Future missions like the James Webb Space Telescope, which NASA will launch in 2019 to peer into the early history of the universe, will therefore "be essential for getting more information on stellar winds and exoplanet atmospheres," the authors say, "thereby paving the way for more accurate estimations of stellar-wind induced atmospheric losses."
Scientists spot potentially habitable worlds with regularity. Recently, a newly discovered Earth-sized planet orbiting Ross 128, a red dwarf star that is smaller and cooler than the sun located some 11 light years from Earth, was cited as a water candidate. Scientists noted that the star appears to be quiescent and well-behaved, not throwing off flares and eruptions that could undo conditions favorable to life.
Collaborating with Dong on the PCb paper were physicists from Harvard University, the Harvard-Smithsonian Center for Astrophysics, the University of California, Los Angeles, and the University of Massachusetts.
More information:Chuanfei Dong et al. Is Proxima Centauri b Habitable? A Study of Atmospheric Loss, The Astrophysical Journal (2017). DOI: 10.3847/2041-8213/aa6438 https://arxiv.org/abs/1702.04089
Chuanfei Dong et al. The Dehydration of Water Worlds via Atmospheric Losses, The Astrophysical Journal (2017). DOI: 10.3847/2041-8213/aa8a60 https://arxiv.org/abs/1709.01219
Scientists reduce the chances of life on exoplanets in so-called habitable zones around red stars
Scientists reduce the chances of life on exoplanets in so-called habitable zones around red stars
PPPL and Princeton University astrophysicist Chuanfei Dong, shown here, and colleagues have thrown water on the theory that many exoplanets may be habitable.
Photo by Elle Starkman, Princeton Plasma Physics Laboratory
John Greenwald, Princeton Plasma Physics Laboratory
Is there life beyond Earth in the cosmos? Astronomers looking for signs have found that our Milky Way galaxy teems with exoplanets, some with conditions that could be right for extraterrestrial life. Such worlds orbit stars in so-called “habitable zones,” regions where planets could hold liquid water that is necessary for life as we know it.
However, the question of habitability is highly complex. Researchers led by space physicist Chuanfei Dong of the U.S. Department of Energy’s (DOE) Princeton Plasma Physics Laboratory (PPPL) and Princeton University have recently raised doubts about water on — and thus potential habitability of — frequently cited exoplanets that orbit red dwarfs, the most common stars in the Milky Way.
In two papers in The Astrophysical Journal Letters, the scientists develop models showing that the stellar wind — the constant outpouring of charged particles that sweep out into space — could severely deplete the atmosphere of such planets over hundreds of millions of years, rendering them unable to host surface-based life as we know it.
“Traditional definition and climate models of the habitable zone consider only the surface temperature,” Dong said. “But the stellar wind can significantly contribute to the long-term erosion and atmospheric loss of many exoplanets, so the climate models tell only part of the story.”
The research simulates the photochemical impact of starlight and the electromagnetic erosion of stellar wind on the atmosphere of the exoplanets. These effects are twofold: The photons in starlight ionize the atoms and molecules in the atmosphere into charged particles, allowing pressure and electromagnetic forces from the stellar wind to sweep them into space. This process could cause severe atmospheric losses that would prevent the water that evaporates from exoplanets from raining back onto them, leaving the surface of the planet to dry up.
On Proxima Centauri b, the model indicates that high stellar wind pressure would cause the atmosphere to escape and prevent atmosphere from lasting long enough to give rise to surface-based life as we know it. “The evolution of life takes billions of years,” Dong noted. “Our results indicate that PCb and similar exoplanets are generally not capable of supporting an atmosphere over sufficiently long timescales when the stellar wind pressure is high.”
“It is only if the pressure is sufficiently low,” he said, “and if the exoplanet has a reasonably strong magnetic shield like that of the Earth’s magnetosphere, that the exoplanet can retain an atmosphere and has the potential for habitability.”
Complicating matters is the fact that the habitable zone circling red stars could evolve over time. So high stellar wind pressure early on could increase the rate of atmospheric escape. Thus, the atmosphere could have eroded too soon, even if the exoplanet was protected by a strong magnetic field like the magnetosphere surrounding Earth, Dong said. “In addition, such close-in planets could also be tidally locked like our moon, with one side always exposed to the star. The resultant weak global magnetic field and the constant bombardment of stellar wind would serve to intensify losses of atmosphere on the star-facing side.”
Turning to water worlds, the researchers explored three different conditions for the stellar wind. These ranged from:
• Winds that strike the Earth’s magnetosphere today.
• Ancient stellar winds flowing from young, sun-like stars that were just a toddler-like 0.6 billion years old compared with the 4.6 billion year age of the sun.
• The impact on exoplanets of a massive stellar storm like the Carrington event, which knocked out telegraph service and produced auroras around the world in 1859.
The simulations illustrated that ancient stellar wind could cause the rate of atmospheric escape to be far greater than losses produced by the current solar wind that reaches the magnetosphere of Earth. Moreover, the rate of loss for Carrington-type events, which are thought to occur frequently in young sun-like stars, was found to be greater still.
“Our analysis suggests that such space weather events may prove to be a key driver of atmospheric losses for exoplanets orbiting an active young sun-like star,” the authors write.
Given the increased activity of red stars and the close-in location of planets in habitable zones, these results indicate the high probability of dried-up surfaces on planets that orbit red stars that might once have held oceans that could give birth to life. The findings could also modify the famed Drake equation, which estimates the number of civilizations in the Milky Way, by lowering the estimate for the average number of planets per star that can support life.
Authors of the PCb paper note that predicting the habitability of planets located light years from Earth is filled with uncertainties. Future missions like the James Webb Space Telescope, which NASA will launch in 2019 to peer into the early history of the universe, will therefore “be essential for getting more information on stellar winds and exoplanet atmospheres,” the authors say, “thereby paving the way for more accurate estimations of stellar-wind induced atmospheric losses.”
Scientists spot potentially habitable worlds with regularity. Recently, a newly discovered Earth-sized planet orbiting Ross 128, a red dwarf star that is smaller and cooler than the sun located some 11 light years from Earth, was cited as a water candidate. Scientists noted that the star appears to be quiescent and well-behaved, not throwing off flares and eruptions that could undo conditions favorable to life.
Collaborating with Dong on the PCb paper were physicists from Harvard University, the Harvard-Smithsonian Center for Astrophysics, the University of California, Los Angeles, and the University of Massachusetts. Support for the work came from a NASA Jack Eddy postdoctoral fellowship for Dong through the Princeton Center for Heliophysics, led by Professor Amitava Bhattacharjee, head of the PPPL Theory Department who serves as Dong’s postdoctoral adviser, and the Max Planck-Princeton Research Center for Plasma Physics, jointly financed by the DOE Office of Science and the National Science Foundation. Collaborating on the water world research were scientists from the University of Michigan, the Harvard-Smithsonian Center for Astrophysics and Harvard University. The NASA Jack Eddy postdoctoral fellowship supported Dong.
PPPL, on Princeton University’s Forrestal Campus in Plainsboro, New Jersey, is devoted to creating new knowledge about the physics of plasmas — ultra-hot, charged gases — and to developing practical solutions for the creation of fusion energy. The laboratory is managed by the University for the U.S. Department of Energy’s Office of Science, which is the largest single supporter of basic research in the physical sciences in the United States, and is working to address some of the most pressing challenges of our time.
When news of a newly-studied exoplanet with an atmosphere begins to make headlines it’s typically because the far-off world is potentially Earth-like, teasing the possibility of extraterrestrial life or even a potential future home for mankind. WASP-18b is not one of those kinds of exoplanets. In fact, it’s so incredibly hostile to what we know about life that researchers had a difficult time explaining its existence at all.
WASP-18b is an absolutely huge planet, with a mass on the order of 10 times that of Jupiter, and it’s also incredibly hot. The planet orbits its star at a very short distance, which isn’t entirely uncommon for exoplanets, but what makes the alien world so strange is that it has a thick atmosphere that left scientists scratching their heads.
After observing the planet several times, that data revealed that WASP-18b’s atmosphere is packed with poisonous carbon monoxide. That’s not just a rarity among known planets; it’s essentially unheard of. “The composition of WASP-18b defies all expectations,” Kyle Sheppard of NASA’s Goddard Space Flight Center, lead author of the study explains. “We don’t know of any other extrasolar planet where carbon monoxide so completely dominates the upper atmosphere.”
The research, which was published in Astrophysical Journal Letters, also reveals that the planet’s puzzling atmosphere is devoid of any water, and thereby oxygen. The combination of no water, no oxygen, incredible heat, and plenty of carbon monoxide means that WASP-18b isn’t the kind of place you’d want to spend a day, or even a few seconds.
The deadly conditions also suggests there’s really no conceivable way life as we know it could form or exist there. That’s just fine anyway, since the world is some 325 light-years away, so visiting it is out of the question.
That said, the discovery is important for a number of reasons, not least of which is that it totally rewrites what scientists thought they knew about how atmospheres form around planets. This particular example is obviously hostile to life, but might raise the possibility of certain exoplanets forming much friendlier atmospheres in ways we had not yet considered. Further research into WASP-18b is planned for later, and scientists hope to use the new James Webb Space Telescope to get an even better look at it.
That’s the question Enrico Fermi asked his co-workers at the at Los Alamos National Laboratory in 1950 as they pondered lunch and why, if there are billions of stars in the Milky Way galaxy older than our Sun with a high probability of having planets similar to Earth, we’ve never had any contact (that they knew of) with other civilizations – advanced or lesser. The question lives on today as the famous Fermi Paradox.
“Redo the numbers, Enrico. They just found 72 more galaxies!”
If they were alive today, that might his friends’ response to the news that astronomers taking the deepest view of the universe ever have discovered at least 72 more galaxies. Even using conservative estimates, that’s a few trillion more stars and, if they average 8 planets like ours, many trillions more planets, of which a tiny but now larger percentage could hold life.
“Where is everybody?”
It’s not a puzzle … it’s a paradox.
Let’s take the easy answer first. In a press release this week, ESO astronomers announced that they pointed the Multi Unit Spectroscopic Explorer (MUSE) instrument on the ESO’s Very Large Telescope (VLT) in Chile at a small spot in space known as the Hubble Ultra Deep Field (HUDF). Located in the constellation Fornax, it was first observed by the Hubble Space Telescope from September 24, 2003, to January 16, 2004. That data allowed astronomers to look back 13 billion years and, combined with later observations using the Wide Field Camera 3 (WFC3), estimate that the small region contained about 10,000 galaxies.
Then came MUSE. It was installed on the VTL in 2014 and astronomers used it for about two years (137 hours of telescope time) to further study the HUDF and detect galaxies 100 times dimmer than before that emit Lyman-alpha radiation, an indication that they are extremely distant, young, low-mass galaxies. Seventy-two of these galaxies were counted, with some estimated to have existed just 800 million years after the Big Bang.
The Hubble Ultra Deep Field
As always with discoveries like these, if there’s one Lyman-alpha emitting galaxy (or in this case, 72), there’s bound to be more, so analysis of the Hubble Ultra Deep Field with the Multi Unit Spectroscopic Explorer will continue, along with planned observations using the upcoming James Webb Space Telescope (after delays, it’s expected to be launched in June 2019) and the Advanced Technology Large-Aperture Space Telescope (ATLAST) which is still in the conceptual stage.
Back to Fermi’s Paradox. Does it increase the probability of other life forms in the universe? Yes. Does the fact that these newly-found galaxies are close to 13 billion years old mean the life forms will be older and more advanced than us? Older — definitely. More advanced – who knows? If they are, Enrico once again gets the last words:
A prolific UFO hunter claims he is planning to sue the US space agency to force it to bring an end to an alleged cover up over the existence of alien life.
Scott C Waring is one of a string of conspiracy theorists who are convinced intelligent aliens not only exist but are living here on Earth- they also insisted the aliens secretly working with the US authorities.
The so-called truth embargo was put in place after the alleged Roswell flying saucer crash of July 1947, the conspiracy theory claims.
And the alleged truth embargo is an agreement between all officials in the know never to release the truth to the public due to a fear it would bring about the end of religion and the rule of law and lead to anarchy.
Getty
A UFO hunters has thrown down the gauntlet to NASA over aliens.
I am really close to using this site to go to court (public VS NASA) in an international fight to see if I can force NASA into announcing the truth (about aliens) to the world.
Scott C Waring
Mr Waring has claimed repeatedly on his website ufosightingsdaily.com that NASA is aware aliens exist and is at the heart of the cover up.
In a blog post which claims his website was under attack from the US authorities, he announced he was close to taking the legal action against NASA.
He said: "I am really close to using this site to go to court (public VS NASA) in an international fight to see if I can force NASA into announcing the truth (about aliens) to the world.
It is not clear from the post if he has filed any papers, or if he genuinely intends launching what would be an historic case.
NASA denies it has evidence of aliens or being involved in any cover ups.
The US space agency does not comment on individual conspiracy theory claims but has previously said it would be more than happy to announce if any evidence of alien life is found.
Howevever, it mainstains, so far, this has yet to happen.
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- Gemiddelde waardering: 0/5 - (0 Stemmen) Categorie:ALIEN LIFE, UFO- CRASHES, ABDUCTIONS, MEN IN BLACK, ed ( FR. , NL; E )
Researchers confirm age of Jesus Christ’s tomb
Researchers confirm age of Jesus Christ’s tomb
Archaeologists have finally discovered the age of the tomb of Jesus Christ.
According to various beliefs, the Church of the Holy Sepulchre in Jerusalem is believed to contain the final resting place of Jesus Christ.
The tomb has been desecrated over the years by violent attacks, natural disasters, and of course centuries of wear and tear. This has led to a number of reconstructions over the centuries, reason why modern scholars have had a tough time proving or disproving this is the tomb of Jesus Christ.
Now, to solve the mystery from a scientific point of view, researchers analyzed the original limestone surface of the tomb and a marble slab hoping to establish a time frame when the tomb was created.
As noted by the National Geographic, researchers believe the tomb dates back to around 345 CE.
“Obviously that date is spot-on for whatever Constantine did,” archaeologist Martin Biddle, who published a study on the tomb in 1999, told National Geographic. “That’s very remarkable.”
Led by experts from the National Technical University of Athens and to calculate the age of the materials of the tomb, a technique called “optically stimulated luminescence” (OSL) was used, which revealed when the material was exposed to light for the last time.
Image Credit: Oded Balilty, AP for National Geographic
While the study has failed to establish whether or not Jesus was actually buried there, the date obtained by experts is consistent with historical accounts that the tomb was found by the Romans and enshrined around 326 CE.
Curiously, this fits the time of Emperor Constantine, Rome’s first Christian emperor.
According to legend, Helena, the mother of the Roman emperor Constantine (reigned ca. 306-337), discovered the tomb of Jesus around the year 327.
Constantine legalized Christianity throughout the Roman Empire and supposedly became Christian little before dying.
The Romans would have protected the tomb by building a sanctuary on it, as well as a church.
The church was destroyed, renovated and rebuilt several times in the past 1,700 years.
Before this new research, the oldest piece of architectural evidence at the site was traced back to the time of the Crusades, which means it was only around 1,000 years old.
Despite the fact that there are many who doubt that Jesus Christ existed, there is enough historical evidence to support the fact that Jesus of Nazareth was a real man and not a mythological figure.
Thousands of historic and archeological sites along the southern US coast risk being engulfed by sea-level rise by the end of the century, scientists report.
The sites at risk from rising sea-levels. Image credits David G. Anderson et al., 2017, PLOS ONE.
Climate change isn’t putting just our future at risk — it’s also engendering out past, according to new research. More than 13,000 archaeological sites, historic buildings, and cultural landscapes on the Atlantic and Gulf coasts of the southeastern United States are at risk from sea-level rise and could be submerged by 2100.
No ark for this flood
The team, led by David Anderson from the University of Tennessee, Knoxville drew on data from the Digital Index of North American Archaeology (DINAA) to estimate the risk posed by sea-level rise on archaeological sites. DINAA is a platform that aggregates archeological and historical datasets compiled over the past century and from numerous sources. Its aim is to provide researchers and the public with a comprehensive view of when and where humans settled.
Based on position and elevation data, the team warns that over 13,000 sites in the southeast alone may find themselves topped with water for a mere 1 meter (3.28 ft) rise. This includes over 1,000 sites listed on the National Register of Historic Places as having important cultural properties. But things could get much, much worse.
“These numbers increase substantially with each additional 1 m rise in sea level, with >32,000 archaeological sites and >2400 NRHP properties lost should a 5 m rise occur,” the authors warn.
“Many more unrecorded archaeological and historic sites will also be lost as large areas of the landscape are flooded. The displacement of millions of people due to rising seas will cause additional impacts where these populations resettle.”
Large linked data sets such as the DINAA, which can predict the potential impacts of phenomena across wide areas, are essential when developing procedures for sampling, triage, and mitigation efforts, the team explains. Therefore, they hold the key to planning and adaptation in the face of climate change, extreme weather events, and the displaced populations these will bring about — factors that could shape our civilization profoundly in the years to come.
“Sea level rise will thus result in the loss of much of the record of human habitation of the coastal margin in the Southeast,” the paper reads, “and the numbers indicate the magnitude of the impact on the archaeological record globally.”
The paper “Sea-level rise and archaeological site destruction: An example from the southeastern United States using DINAA (Digital Index of North American Archaeology)” has been published in the journal PLOS ONE.
Shortly after Earth’s formation, the planet was barren of life. Then, proteins combined in just the right way, and life appeared. For billions of years, it was simple and uninteresting, oceans full of simple, single-celled organisms floating for millennia after millennia. Suddenly, life got a lot more interesting. Organisms became more complex, with more than one cell. And they got much bigger — 10,000 times bigger by volume, Nick Lane, professor of evolutionary chemistry at University College London, wrote in his 2015 book The Vital Question.
The importance of this step — of this sudden increase in size and complexity — cannot be overstated. Without it, complex life (like humans, for example) would not exist.
How exactly this step happened is one of the big questions in evolutionary biology. There are a number of theories about how, exactly, life got so much more complicated. One of the prevailing theories, from Lane himself, focuses on energy. Here’s the thinking: Cells need more energy to build more complex structures. To do that, according to Lane’s theory, single-celled organisms merged with bacteria we now know as mitochondria, which have an electrical charge and bring power to the cell. It’s possible, though unlikely, for the two bacteria to fit together, and even less probably that the two were able to survive and live symbiotically. This occurrence that made possible all other forms of complex life is rare, to be sure.
But in Lane’s opinion, it only happened once.
“It comes down to one merger between two cells that made one cell, then everything comes from that. You, me, the redwood tree or the hummingbird, a fungus, a piece of algae growing in a pond, every form of life we can see with our naked eyes and many that we can’t come from that single cell,” Nick said in an episode of the science podcast Radiolab on his work.
The debate around how life got much more complicated is important to understand the history of life on Earth, but it also could inform our search for life on other planets. If complex life is exceedingly rare, does that make it less likely for us to find intelligent life in the universe? Should we instead be looking for something much smaller and simpler? If the universe outside of Earth only populated by single-celled organisms? Because these specific conditions are so unlikely, might complex life only exist on our own planet?
Futurism got in touch with a few experts to ask if they agree with Lane’s theory, if they believe intelligent extraterrestrial life is possible, and to get their perspectives on whether we should somehow alter our search.
Mohamed Noor, a professor of biology at Duke University:
To the best of my knowledge, Lane’s version of what happened is likely true: Acquiring mitochondria happened [only] once, long ago in the ancestor of plants, fungi, and animals. It greatly facilitated the evolution of multicellular organisms.
However, it’s impossible to know how to assess the need for something like that in the context of life that is totally unrelated to life on Earth. All life on Earth has a single common ancestor. This ancestor (and all life we on Earth) was presumably carbon/water-based, replicated using nucleic acids, and lived in conditions that existed on ancient or modern Earth. If life arose on a much colder world, for example, many other [environmental] parameters may be totally different as well.
In such a case, life there may use liquid ammonia rather than water as a solvent. It may not use nucleic acids for heredity. But some aspects may be general to life —carbon may intrinsically make sense for life, given its abundance and ability to make long chains. A “cell membrane” of some sort to insulate that life from its environment also seems probable. Finally, there are other things we never think about. How “fast” does this life metabolize and interact? Are there generations occurring in the blink of an eye? Or single interactions over millennia, moving so slowly we wouldn’t even notice?
Honestly, I feel like we cannot have any estimate of the probability of life of any kind (intelligent or not) until we move from a sample size of 1 (related to life on Earth) to a sample size of at least 2 [that is, until we discover at least one more example of life in the universe].
Back to your question, any “life” needs a source of power, but mitochondria need not be the only solution to that problem, especially if life is starting with a completely different basis. Still, my best guess is that microbial-sized life is way more likely to exist than something as large as us on other worlds. If our desire is to “find life,” I speculate that we’re much better off closely examining acquired samples from Europa or other worlds than waiting to receive a radio signal.
Pierre Pontarotti, the director of research at the Mathematics Institute of Marseille, wrote:
The symbiosis between bacteria and eukaryotes has occurred many times during the evolution of life on Earth. For example, cyanobacteria [merged] with the ancestors of plant cells — the cyanobacteria became the chloroplast. Therefore, if organisms like bacteria and eukaryotes are present on another planet, the symbiosis should happen.
We, of course, have no information about the kind of life that exists on other planets. But because galaxies and planets have evolved many times during the history of the universe, why shouldn’t life do so as well?
John Rummel, senior scientist with the SETI Institute:
Given the many advantages offered by the symbiosis of the pre-eukaryote and the pre-mitochondrial bacterium, it is entirely possible that once was enough — given that free oxygen could have been present to fuel the combination. “Once” here may not refer to a single endosymbiotic event, of course.
We don’t know exactly where, and at what scale, eating pre-mitochondria became popular on Earth… The right biochemistry is the key to that being an advantageous thing to do, of course, so whether it is widespread in the cosmos is more a biochemical question than a natural-science one. [It has to be] just so… Without mitochondrial advantages, it might be a struggle to develop complex, anoxic biochemistries that could support the evolution of intelligence on a physically challenging world, but not impossible.
A supervolcano could kill millions of humans, pushing us back to a pre-civilization state, far sooner than scientists previously thought, according to a new report in Earth and Planetary Science Letters. But we shouldn’t worry. Something else will probably kill us first, seeing as the global climate is warming, antibiotic-resistant bacteria are thriving, and nuclear war is a greater threat than ever. Against that backdrop, the study suggests, a supervolcano wiping out most or all humans on Earth seems like a non-issue.
Still, it’s not impossible.
In the paper published Wednesday, the Bristol University team revised previous scientific estimates of how often catastrophic supervolcano eruptions occur. While prior research put world-changing eruptions at comfortably wide intervals, the new paper shrinks that timescale considerably. Previous estimates, made in 2004, said that super-eruptions occurred, on average, every 45,000 to 714,000 years, a time scale that Jonathan Rougier, Ph.D., a statistician and the study’s first author, says is “comfortably longer than our civilization.” His new work puts the updated range at 5,200 to 48,000 years, with the “best guess” value at 17,000 years.
This range gives us significantly less time to prepare for the next cataclysmic eruption, but Rougier isn’t bothered by it. “My view … is that we should not be worried about super-eruptions,” Rougier tells Inverse.
Toba Caldera in Sumatra, Indonesia, produced the largest volcanic eruption of the past 2 million years.
Rougier’s study represents a significant change in the estimated frequency of world-changing supervolcano eruptions. By studying geological records covering the past 100,000 years, he and his colleagues found that the two most recent supervolcano eruptions occurred 20 and 30 thousand years ago.
“On balance, we have been slightly lucky not to experience any super-eruptions since then,” reports Rougier. This would seem to suggest that it’s about time we had another one of these super-eruptions, but just because we haven’t seen one doesn’t necessarily mean we’re overdue for one. In all likelihood, something else will probably kill us first.
“The probability of a super-eruption in (say) my lifetime is absolutely tiny, about 2 in 1000,” says Rougier. “From that point of view, super-eruptions are marginal in light of all the things that we need to worry about right now, and all of the other ways in which our civilization might experience a catastrophe over the next few thousand years.
That being said, Rougier notes, there definitely are communities around the world that are at risk for large — but not super — eruptions.
“They do need to plan and to invest in order to reduce their risk.”
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Over mijzelf
Ik ben Pieter, en gebruik soms ook wel de schuilnaam Peter2011.
Ik ben een man en woon in Linter (België) en mijn beroep is Ik ben op rust..
Ik ben geboren op 18/10/1950 en ben nu dus 73 jaar jong.
Mijn hobby's zijn: Ufologie en andere esoterische onderwerpen.
Op deze blog vind je onder artikels, werk van mezelf. Mijn dank gaat ook naar André, Ingrid, Oliver, Paul, Vincent, Georges Filer en MUFON voor de bijdragen voor de verschillende categorieën...
Veel leesplezier en geef je mening over deze blog.