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
Two Giant Black Holes Caught Being Unbelievably Rude in New Image
Two Giant Black Holes Caught Being Unbelievably Rude in New Image
Black holes think they can act however they want just because they’re massive voids. Sadly, a couple of unruly ones decided to photobomb our closest galaxy in a new image composed from X-ray data from NASA’s Chandra X-ray Observatory and optical data from ground-based telescopes.
Scientists have long thought that a source called LGGS J004527.30+413254.3 (AKA J0045+41) was located in the Andromeda Galaxy (AKA M31), was located just 2.5 million light-years away. Not only did astronomers find that J0045+41 was much farther away than they thought — about 2.6 billion light-years from Earth, to be exact — using NASA’s Chandra X-ray Observatory, the Gemini-North telescope in Hawaii and the Caltech’s Palomar Transient Factory in California, they discovered a tightly coupled pair of supermassive black holes within it. The team’s findings have been published in The Astrophysical Journal.
“We were looking for a special type of star in M31 and thought we had found one,” the paper’s lead author Trevor Dorn-Wallenstein of the University of Washington said in a statement. “We were surprised and excited to find something far stranger!”
The revolution will not be televised. It'll be sent to your inbox by us.
The researchers think the two black holes could have come from two galaxies that merged billions of years ago. Now, these two voids are just a couple of buddies who live less than a hundredth of a light-year apart. In fact, it’s possible this black pair might actually merge one day.
“We’re unable to pinpoint exactly how much mass each of these black holes contains,” the study’s co-author John Ruan of the University of Washington said. “Depending on that, we think this pair will collide and merge into one black hole in as little as 350 years or as much as 360,000 years.”
X-ray: NASA/CXC/Univ. of Washington/T.Dorn-Wallenstein et al.;Optical: NASA/ESA/J. Dalcanton, et al. & R. Gendler
While astronomers didn’t exactly find what they set out for, they found a couple of cosmic oddballs. I smell a buddy comedy.
Gravitational Waves Could Help Scientists Solve A Major Black Hole Mystery
Black holes are the undoubtedly some of the hungriest boys in space. Though we’re unlocking some of the mysteries about these spooky voids, there’s still so much out there to be learned — for one thing, we’ve never even directly observed one.
Now, astrophysicists at Brown University and Harvard University who study gravitational waves say these ripples in the fabric of space and time could help them investigate the possible existence of a very specific kind of black hole, one that hypothetically formed right after the Big Bang. The team’s work on how scientists can do this in the future was published Thursday in Physical Review Letters.
Here’s the logic: In the moments after the Big Bang, the density of the cosmos fluctuated so much that this would have caused gravitational collapse, thus creating a number of primordial black holes across the universe. Some scientists have suggested these black holes would have created dark matter, or the mysterious stuff that makes up most of the material universe. But of course, there’s lots of layers of ambiguity and speculation to all of this.
When it comes to primordial black holes, there’s a lot left to investigate — and some very smart people have tried to do just that. In the 1970s, Astrophysicist Stephen Hawkingwas among the first to suggest the existence of primordial black holes — but alas, still no luck finding them.
Simulation frames from a NASA Goddard neutron star merger animation
The researchers involved in this new work think that gravitational wave detectors like those from the LIGO and VIRGO Scientific Collaborations — which had some incredible recent successes in their most recent observing run — could be helpful tools for primordial black hole hunting.
“The idea is very simple,” the study’s co-author Savvas Koushiappas, an associate professor of physics at Brown University, said in a statement. “With future gravitational wave experiments, we’ll be able to look back to a time before the formation of the first stars. So if we see black hole merger events before stars existed, then we’ll know that those black holes are not of stellar origin.”
Scientists use redshift — which describes the frequency of wavelengths — to determine how far back in time an event took place. The higher the redshift, the older an event.
For the sake of this study, the events in question would be black hole mergers. According to the researchers, gravitational wave detectors should be sensitive enough to detect a redshift of 40, which is equivalent to about 64 million years after the Big Bang. If they’re able to detect black hole mergers beyond this redshift, this could prove the existence of primordial black hole mergers.
At this point, there are still so many more questions than answers when it comes to primordial black holes. Future generations of gravitational wave detectors will be even more sensitive, allowing scientists to understand so much more about these space-time ripples.
At least the hunt for these ancient, hungry giants will be fun.
Supervolcano eruptions would make any other eruption pale in comparison.
Image via Wikipedia.
Volcanic eruptions come in many sizes and “flavors”. There are the basic, almost harmless lava flows like in Hawaii, the small rock-throwers, the pyroclastic flows, and then there are the really big ones; on top of all eruptions, in terms of strength, are the so-called supervolcano eruptions, large enough to change life as we know it and potentially return humanity to a pre-civilization state. Needless to say, we’d want to know as much as possible about these eruptions.
Thankfully, they happen quite rarely. A 2014 study estimated that such eruptions (which throw over 1,000 gigatons of material) happen once every 45,000 to once every 714,000 years. There’s no fixed cyclicity and there’s an inherent variability of such estimates, but even at the lower end, that’s not a panic-inducing figure. After all, 45,000 years is much longer than the time that has passed since mankind emerged as a proper civilization. But a new study concluded differently.
Researchers from the University of Bristol’s Schools of Earth Sciences and Mathematics report that, according to their analysis, the average time between such eruptions is only slightly greater than the age of our civilization. Jonathan Rougier, Professor of Statistical Science, says the “best guess value” is once every 17,000 years:
“The previous estimate, made in 2004, was that super-eruptions occurred on average every 45 – 714 thousand years, comfortably longer than our civilization.”
“But in our paper just published, we re-estimate this range as 5.2 – 48 thousand years, with a best guess value of 17 thousand years.”
They reached this conclusion by analyzing a large database. The difference doesn’t necessarily come from a different type of analysis or statistical approach, it comes from the fact that we now we have access to a larger database than we did a decade ago. Basically, we’ve had enough time to do more studies and we now know more about eruptions than we did in 2004.
Based on these recent figures, we’ve been quite lucky to evade supereruptions in our recent history, but it’s also important to note that volcanic activity follows no strict cycle or pattern. Just because eruptions tend to happen with this periodicity doesn’t mean they’ll always stick to it.
“On balance, we have been slightly lucky not to experience any super-eruptions since then,” Rougier added in a statement. “But it is important to appreciate that the absence of super-eruptions in the last 20,000 years does not imply that one is overdue. Nature is not that regular.”
The chances of such an eruption happening in the next 1,000 years is relatively small, and our civilization will change in unforeseeable ways in the next thousand years (just think of how much has changed in the past century). Furthermore, researchers argue, there are other issues far more pressingthan a supervolcano eruption.
Journal Reference:
‘The global magnitude-frequency relationship for large explosive volcanic eruptions’ by J. Rougier, S. Sparks, K. Cashman, and S. Brown, in Earth and Planetary Science Letters.
WASP-18b was first identified by the Wide Angle Search for Planets survey which uses a double setup each comprising 8 cameras that cover 480 degrees of the sky. One set of cameras lies in the northern hemisphere, the other in the southern hemisphere. Since both setups entered operation in 2006, astronomers have used them to gather data on 30 million stars. By studying small changes or wobbles in the light of a star, scientists can determine whether a planet is passing by and, if yes, they can derive some of its properties. WASP-18b, along with another 100 planets or so have been discovered by the survey in this manner.
What's a Hot Jupiter
A ‘Hot Jupiter’ is an exoplanet like Jupiter but much hotter, with orbits that take it feverishly close to the parent star.
This behemoth planet is quite different from many others discovered by the WASP survey or the prolific Kepler Space Telescope responsible for over 2,000 confirmed exoplanet sightings. When NASA scientists directed the lenses of the Hubble and Spritzer telescopes towards WASP-18b, they determined that there likely isn’t any water in the stratosphere which is instead largely made of carbon monoxide. Data suggests the stratosphere is packed with hot gas while the lower troposphere is dominated by cooler carbon monoxide.
“The composition of WASP-18b defies all expectations,” said Kyle Sheppard of NASA’s Goddard Space Flight Center in Greenbelt, Maryland.
“We don’t know of any other extrasolar planet where carbon monoxide so completely dominates the upper atmosphere,” Sheppard said.
The team determined the two types of carbon monoxide signatures at a wavelength of about 1.6 micrometers and an emission signature at about 4.5 micrometers. This is the first time researchers have detected both types of fingerprints for a single type of molecule in an exoplanet’s atmosphere.
With a smothering stratosphere loaded with carbon monoxide and devoid of water, the hot-Jupiter-class planet WASP-18b may have formed quite differently from our own Jupiter: http://go.nasa.gov/2BA4PIj
All of these observations point to the curious possibility that this planet may contain 300 times more metals than other exoplanets of similar mass. If that’s true, WASp-18b clearly did not form in the same way as other Hot Jupiters before it.
“This rare combination of factors opens a new window into our understanding of physicochemical processes in exoplanetary atmospheres,” said Nikku Madhusudhan, a co-author of the study from the University of Cambridge.
SCIENTISTS HAVE CREATED A SEMI-SYNTHETIC ORGANISM THAT PRODUCES BIOLOGICAL COMPOUNDS UNKNOWN TO NATURE
SCIENTISTS HAVE CREATED A SEMI-SYNTHETIC ORGANISM THAT PRODUCES BIOLOGICAL COMPOUNDS UNKNOWN TO NATURE
The building blocks of DNA have been expanded by scientists who have created a semi-synthetic organism that is stable that is able to produce biological compounds that have never been seen before.
NEW LIFE-FORM RESEARCHERS DEVELOPED HAVE SIX NUCLEOTIDES NOT FOUR
DNA makes up all things that are living on Earth, and it is made up of four nucleotides that are basic. However, the new life-form researchers in the United States have developed have six, and this leads to things becoming very interesting. The SSO, or semi-synthetic organism, that has been engineered by a team from Scripps Research Institute in California has been made up from the four regular nucleobases that humans are.
Fluorescent image of Synthorx’s semi-synthetic organism
These are adenine, cytosine, guanine, and thymine, but it also has two nucleotides that are unnatural too. This means that it gets two more letters, X, and Y in the DNA base pairs, which are essentially the rungs of the ladder that hold the helix spirals of the DNA together.
Members of the research team engineered the same kind of synthetic DNA base pair in 2014, and this revealed that it could be incorporated into E. Coli bacteria that had been modified. This led to the creation of the first-ever living organism with extra letters in it, and it also gave way to the expansion of genetic code that could essentially allow for new types of biological process. However, there was an issue, and this was with the stability. The semi-synthetic organism was able to hold onto its unnatural nucleotides, but it was unable to maintain them when cells were dividing, indefinitely.
CRISPR-CAS9 WAS USED BY RESEARCHERS
Floyd Romesberg, the senior lead researcher, said that the genome is not only stable for a day; it needs to have stability over the scale of a lifetime. He went on to say that if the semisynthetic organism was going to be an organism, then it has to be able to maintain the information in a stable condition.
Professor Floyd Romesberg (right) and Graduate Student Yorke Zhang led the new study at The Scripps Research Institute
To work around this, the researchers came up with a way for the semi-synthetic organism to be able to hold onto the X and Y base pair that was unnatural. This was made possible due to a nucleotide transporter so that better DNA replication was better, a Y molecule that was optimized and an engineering system that was refined and which made use of CRISPR-Cas9.
RESEARCHERS REVEALED FIRST STABLE ORGANISM WITH 6-LETTER CODE IN JANUARY
The results of this were first revealed in January and it was the first ever organism formed that was stable using the 6-letter genetic code.
Now a new study has been published and the researchers have revealed that more improvements of that kind have been made to the molecular stability thanks to semi-synthetic bacterium that is able to transcribe and then translate the unnatural X and Y nucleotides with the exact same efficiency as the natural nucleotides, which are A, C, G, and T.
Thanks to a new transcription process the organism is able to synthesize proteins that contain the non-canonical amino acids and this is a process that might shed new light on ways of replicating molecules with reliance that is less on hydrogen bonds.
At an extremely high magnification of 44,818x, this colorized scanning electron microscopic (SEM) image reveals some of the morphologic details
The team of scientists said in a paper that this showed that for each step of information storage and its retrieval, the hydrogen bonds, which were central to the natural base pairs, might be in some part replaced with packing that was complementary along with hydrophobic forces. Despite the mechanism of decoding, which was said to be novel, the codons could be decoded just as efficiently as their natural counterparts.
BY-PRODUCTS ARE FIRST GENERATION DERIVED PROTEINS NEVER SEEN BEFORE
The scientists have revealed that the by-products are the first of a new generation of derived proteins that are semi-synthetic and which have never before been seen in nature due to them having stable and indefinite incorporation of the base pair that is unnatural. The researchers said that they had examined the decoding of the two unnatural codons and the UBP is not likely to be limited to them.
They went on to say that the first SSI that was reported is thought to be only the first of the new type of semi-synthetic life that can gain access to a wide range of forms and functions that have not been available to natural organisms. At the moment the researchers do not know where this is going to lead, however, one thing is for sure and this is that complexity of life on Earth has taken a huge step forward.
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INTELLIGENT ALIEN LIFE DOESN'T EXIST IN THE UNIVERSE, SCIENTIST CLAIMS
INTELLIGENT ALIEN LIFE DOESN'T EXIST IN THE UNIVERSE, SCIENTIST CLAIMS
When the Earth was formed, there was no life on the planet until proteins got together correctly and life burst forth.
For many billions of years, life on Earth was uninteresting and simple, the oceans were packed with simple single-cell organisms and it remained this way for many years.
Then life got more interesting as organisms began to get more complex and had more than a single cell. They grew larger, up to 10,000 times bigger by volume according to professor of evolutionary chemistry, Nick Lane, from the University College London.
INCREASE IN COMPLEXITY AND SIZE WAS IMPORTANT STEP TO EXISTENCE OF HUMANS
This step was one that was important and the sudden increase in the complexity and size is something that cannot be overstated. Without this step, more complex life, such as human beings, would not exist. But just how this step came to happen is one of the biggest questions in evolutionary biology. There are many theories as to how life managed to get so much more complicated. One theory that Lane has is a focus on energy.
Instinct, Study Claims Cells need energy in order to be able to build structures that are more complex. The theory of Lane is that single-celled organisms managed to merge with bacteria called mitochondria. This has an electrical charge and brings power to cells and it is possible, although not very likely, that the two bacteria fitted together and was able to survive and live, which is even less probable. The happening may have made possible all forms of complex life is rare, but Lane believes that it happened once.
EVERYTHING CAME FROM MERGER OF TWO CELLS
Lane said that it comes down to a merger of two cells, which then became one and then everything came from that. This includes humans, birds, fungus, algae, every type of life that can be seen and even those that we cannot, all came from that single cell.
When considering how life got so much more complicated it is important to consider the history of life on Earth and it could help to inform the search for life on other planets. Complex life is very rare but does this mean it is less likely for people to find intelligent life in the universe. Instead, should we look for something that is smaller and much simpler? Could it be possible that the universe that is outside of Earth is only populated by organisms that are single-celled? As the specific conditions are unlikely is it also possible that complex life might exist only on planet Earth?
MITOCHONDRIA HELPED WITH EVOLUTION OF ORGANISMS WITH MULTI-CELLS
Experts have debated the theory of Lane and asked if they think intelligent extra-terrestrial life is possible. Professor of biology at Duke University, Mohamed Noor, said that he thought Lane’s theory was true. He said that mitochondria arrived in the ancestor of plants, animals, and fungi a long time ago and it helped facilitate the evolution of organisms with multi-cells.
He also said that there is a single common ancestor in all life on Earth and it is carbon/water based and was replicated by nucleic acids and lived in conditions that existed on both ancient and in modern Earth. He went on to say that if life had arrived on a world that was much colder, other parameters in the environment would be different.
The director of research at the Mathematics Institute of Marseille said that the symbiosis between eukaryotes and bacteria had happened numerous times throughout the evolution of life. He said that cyanobacteria merged with plant cells and then became chloroplast. If the organisms such as bacteria and eukaryotes were present on any other planet, then symbiosis would happen.
He said that they did not have any other information about the type of life that might exist on other planets. However, planets and galaxies had managed to evolve a great deal throughout the history of the universe and so it may be possible that life would too.
FREE OXYGEN FUELED COMBINATION OF PRE-MITOCHONDRIAL BACTERIUM AND PRE-EUKARYOTE
Senior scientist at the SETI Institute, John Rummel, said that with the advantages that were offered by the symbiosis of pre-mitochondrial bacterium and pre-eukaryote, it might be possible that only once would have been enough as free oxygen might have been present and this would have fueled the combination.
He went on to say that we have no idea where and at what the eating of pre-mitochondria scale might have become popular on planet Earth. Biochemistry is the key to whether or not it is advantageous and whether or not it is widespread in the cosmos is a question that is more biochemical than a natural science one. With the advantages of mitochondrial, it may have been quite a struggle for anoxic, complex biochemistries to develop that would be able to support the evolution of intelligence on a world that was physically challenging, but not entirely impossible.
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EUROPEAN TELESCOPE REVEALS 72 HIDDEN GALAXIES
EUROPEAN TELESCOPE REVEALS 72 HIDDEN GALAXIES
When astronomers working with the powerful Hubble Space Telescope captured images of around ten thousand galaxies in the distant universe, it was considered to be one of the richest and most phenomenal images of the universe to have ever been captured.
It was assumed that it would take a long time for astronomers to be able to top this incredible achievement. However, astronomers working in Chile seem to have managed to add to this astonishing accomplishment.
The stunning image of thousands of galaxies was captured by researchers working with the Hubble Space Telescope between September 2003 and January 2004. The researchers turned the telescope towards a small patch in the sky in the Fornax constellation – approximately in an area less than two percent of the area of the full moon – where thousands of galaxies could be found. It was immediately discovered that some of these galaxies were formed in the immediate aftermath of the Big Bang, approximately 13.8 billion years ago.
REMARKABLE NEW IMAGE FROM HUBBLE SHOWS 72 PREVIOUSLY UNDISCOVERED GALAXIES!
Now, astronomers using MUSE have found that this particular area of the universe is even richer than the images captured by the Hubble Space Telescope suggested. They were able to study an additional 1600 galaxies in that region by breaking down the light in the area into various colors using a technique called spectroscopy. Using this method, the astronomers discovered seventy-two galaxies which had not been detected by the Hubble Space Telescope, and they believe that these galaxies may have formed around 13 billion years ago, in the period following the Big Bang.
"MUSE can do something that Hubble can't — it splits up the light from every point in the image into its component colours to create a spectrum, "explained Roland Bacon from the Lyon Centre for Astrophysics Research who worked on the project, "This allows us to measure the distance, colours and other properties of all the galaxies we can see — including some that are invisible to Hubble itself.
The data produced by this study is considered to be of immense significance to scientists across various fields. It has been said that the observations made by the astronomers have turned up a veritable goldmine of information particularly when it comes to the hydrogen haloes that form around galaxies which were created in the immediate aftermath of the Big Bang.
The observations were published in the journal Astronomy & Astrophysics:
UT AustinGeoffrey Smith en Brent Landau deden de ontdekking.
WETENSCHAP & PLANEETTwee professoren van de universiteit van Texas in Austin hebben een uitzonderlijke ontdekking gedaan tijdens opzoekingswerk in de bibliotheek van de universiteit van Oxford. Ze vonden er een origineel exemplaar van een verboden christelijk geschrift waarin de geheime leer van Jezus staat.
In de teksten onthult Jezus aan Johannes een reeks geheimen over het rijk van zijn vader in de hemel en hoe hij daar kan binnenkomen, maar ook enkele toekomstige gebeurtenissen, waaronder de marteldood van Johannes zelf. Hij geeft ook raad over hoe hij bovennatuurlijke uitdagingen het hoofd kan bieden. Doel was dat hij die leer dan verder zou doorgeven na de dood van Jezus. “Het is een aanvulling op de figuur en het leven van Jezus die we kennen uit de Bijbel”, aldus professor Geoffrey Smith.
De geschriften werden in de vierde eeuw niet opgenomen in het boek dat later de Bijbel zou worden. Athanasius, de bisschop van Alexandrië, somde toen in zijn ‘Paasbrief van 367’ de 27 boeken op van het Nieuwe Testament en voegde toe: “Niemand mag er nog iets aan toevoegen of uit weglaten”. Daardoor werden ze als verboden en ketters beschouwd.
De professoren vermoeden dat het handschrift een model was dat een leraar gebruikte om zijn leerlingen te leren lezen en schrijven. “Bijna alle woorden zijn verdeeld in lettergrepen, wat bijzonder ongewoon is voor oude manuscripten, tenzij is een onderwijscontext”, aldus prof Brent Landau.
Volgens Smith en Landau gaat het om documenten uit de vijfde of zesde eeuw, maar zouden ze zelf ook afstammen van nog veel oudere teksten. Ze werden opgesteld in het Grieks en waren tot nu toe alleen bekend van latere Koptische vertalingen.
Uitzonderlijk
De vondst is uitzonderlijk, want tot nu toe werd maar een klein aantal originele Griekse exemplaren gevonden van de Nag Hammadigeschriften. Dat is een verzameling teksten uit de begintijd van het christendom, waarvan in 1945 een Koptische vertaling werd gevonden in Boven-Egypte.
“Zeggen dat we opgewonden waren toen we beseften wat we gevonden hadden, is te zacht uitgedrukt”, lacht Smith. “We hadden nooit durven denken dat er nog Griekse fragmenten van de Eerste Apocalyps van Johannes uit de oudheid bewaard gebleven zouden zijn. Maar daar waren ze.”
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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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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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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.
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Ik ben Pieter, en gebruik soms ook wel de schuilnaam Peter2011.
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