#Astronomy & Cosmology

[jcmarchi]

Webb Unlocks Secrets of One of the Most Distant Galaxies Ever Seen - Technology Org

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Webb Unlocks Secrets of One of the Most Distant Galaxies Ever Seen - Technology Org

Looking deeply into space and time, two teams using NASA’s James Webb Space Telescope have studied the exceptionally luminous galaxy GN-z11, which existed when our 13.8 billion-year-old universe was only about 430 million years old.

Initially detected with NASA’s Hubble Space Telescope, this galaxy — one of the youngest and most distant ever observed  — is so bright that it is challenging scientists to understand why. Now, GN-z11 is giving up some of its secrets.

Vigorous Black Hole Is Most Distant Ever Found

A team studying GN-z11 with Webb found the first clear evidence that the galaxy is hosting a central, supermassive black hole rapidly accreting matter. Their finding makes this the farthest active supermassive black hole spotted to date.

“We found extremely dense gas that is common in the vicinity of supermassive black holes accreting gas,” explained principal investigator Roberto Maiolino of the Cavendish Laboratory and the Kavli Institute of Cosmology at the University of Cambridge in the United Kingdom. “These were the first clear signatures that GN-z11 is hosting a black hole that is gobbling matter.”

Image: GOODS-North field of galaxies

This image from NASA’s James Webb Space Telescope NIRCam (Near-Infrared Camera) instrument shows a portion of the GOODS-North field of galaxies. At lower right, a pullout highlights the galaxy GN-z11, which is seen at a time just 430 million years after the big bang. The image reveals an extended component, tracing the GN-z11 host galaxy, and a central compact source whose colors are consistent with those of an accretion disk surrounding a black hole. Image credit: NASA, ESA, CSA, Brant Robertson (UC Santa Cruz), Ben Johnson (CfA), Sandro Tacchella (Cambridge), Marcia Rieke (University of Arizona), Daniel Eisenstein (CfA)

Using Webb, the team also found indications of ionized chemical elements typically observed near accreting supermassive black holes. Additionally, they discovered a very powerful wind being expelled by the galaxy. Such high-velocity winds are typically driven by processes associated with vigorously accreting supermassive black holes.

“Webb’s NIRCam (Near-Infrared Camera) has revealed an extended component, tracing the host galaxy, and a central, compact source whose colors are consistent with those of an accretion disk surrounding a black hole,” said investigator Hannah Übler, also of the Cavendish Laboratory and the Kavli Institute.

Together, this evidence shows that GN-z11 hosts a 2-million-solar-mass, supermassive black hole in a very active phase of consuming matter, which is why it’s so luminous.

Pristine Gas Clump in GN-z11’s Halo Intrigues Researchers

A second team, also led by Maiolino, used Webb’s NIRSpec (Near-Infrared Spectrograph) to find a gaseous clump of helium in the halo surrounding GN-z11.

“The fact that we don’t see anything else beyond helium suggests that this clump must be fairly pristine,” said Maiolino. “This is something that was expected by theory and simulations in the vicinity of particularly massive galaxies from these epochs — that there should be pockets of pristine gas surviving in the halo, and these may collapse and form Population III star clusters.”

Finding the never-before-seen Population III stars — the first generation of stars formed almost entirely from hydrogen and helium — is one of the most important goals of modern astrophysics. These stars are anticipated to be massive, luminous, and hot. Their expected signature is the presence of ionized helium and the absence of chemical elements heavier than helium.

The formation of the first stars and galaxies marks a fundamental shift in cosmic history, during which the universe evolved from a dark and relatively simple state into the highly structured and complex environment we see today.

Image: Pristine Gas Clump Near GN-z11

This two-part graphic shows evidence of a gaseous clump of helium in the halo surrounding galaxy GN-z11. In the top portion, at the far right, a small box identifies GN-z11 in a field of galaxies. The middle box shows a zoomed-in image of the galaxy. The box at the far left displays a map of the helium gas in the halo of GN-z11, including a clump that does not appear in the infrared colors shown in the middle panel. In the lower half of the graphic, a spectrum shows the distinct “fingerprint” of helium in the halo. The full spectrum shows no evidence of other elements and so suggests that the helium clump must be fairly pristine, made of hydrogen and helium gas left over from the big bang, without much contamination from heavier elements produced by stars. Theory and simulations in the vicinity of particularly massive galaxies from these epochs predict that there should be pockets of pristine gas surviving in the halo, and these may collapse and form Population III star clusters. Image credit: NASA, ESA, CSA, Ralf Crawford (STScI)

In future Webb observations, Maiolino, Übler, and their team will explore GN-z11 in greater depth, and they hope to strengthen the case for the Population III stars that may be forming in its halo.

Astronomy & Astrophysics has accepted the research on the pristine gas clump in GN-z11’s halo for publication. The study results of GN-z11’s black hole were published in the journal Nature. The data was obtained from the JWST Advanced Deep Extragalactic Survey (JADES), a joint project between the NIRCam and NIRSpec teams.

Source: National Aeronautics and Space Administration

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[tastydregs]

AI Is Speeding Up Astronomical Discoveries

Photo: John Moore (Getty Images)

First Full-Color Images From Webb Space Telescope

The famous first image of a black hole just got two times sharper. A research team used artificial intelligence to dramatically improve upon its first image from 2019, which now shows the black hole at the center of the M87 galaxy as darker and bigger than the first image depicted.

I’m an astronomer who studies and has written about cosmology, black holes and exoplanets. Astronomers have been using AI for decades. In fact, in 1990, astronomers from the University of Arizona, where I am a professor, were among the first to use a type of AI called a neural network to study the shapes of galaxies.

Since then, AI has spread into every field of astronomy. As the technology has become more powerful, AI algorithms have begun helping astronomers tame massive data sets and discover new knowledge about the universe.

Better telescopes, more data

As long as astronomy has been a science, it has involved trying to make sense of the multitude of objects in the night sky. That was relatively simple when the only tools were the naked eye or a simple telescope, and all that could be seen were a few thousand stars and a handful of planets.

A hundred years ago, Edwin Hubble used newly built telescopes to show that the universe is filled with not just stars and clouds of gas, but countless galaxies. As telescopes have continued to improve, the sheer number of celestial objects humans can see and the amount of data astronomers need to sort through have both grown exponentially, too.

For example, the soon-to-be-completed Vera Rubin Observatory in Chile will make images so large that it would take 1,500 high-definition TV screens to view each one in its entirety. Over 10 years it is expected to generate 0.5 exabytes of data – about 50,000 times the amount of information held in all of the books contained within the Library of Congress.

There are 20 telescopes with mirrors larger than 20 feet (6 meters) in diameter. AI algorithms are the only way astronomers could ever hope to work through all of the data available to them today. There are a number of ways AI is proving useful in processing this data.

One of the earliest uses of AI in astronomy was to pick out the multitude of faint galaxies hidden in the background of images.

ESA/Webb, NASA & CSA, J. Rigby, CC BY

Picking out patterns

Astronomy often involves looking for needles in a haystack. About 99% of the pixels in an astronomical image contain background radiation, light from other sources or the blackness of space – only 1% have the subtle shapes of faint galaxies.

AI algorithms – in particular, neural networks that use many interconnected nodes and are able to learn to recognize patterns – are perfectly suited for picking out the patterns of galaxies. Astronomers began using neural networks to classify galaxies in the early 2010s. Now the algorithms are so effective that they can classify galaxies with an accuracy of 98%.

This story has been repeated in other areas of astronomy. Astronomers working on SETI, the Search for Extraterrestrial Intelligence, use radio telescopes to look for signals from distant civilizations. Early on, radio astronomers scanned charts by eye to look for anomalies that couldn’t be explained. More recently, researchers harnessed 150,000 personal computers and 1.8 million citizen scientists to look for artificial radio signals. Now, researchers are using AI to sift through reams of data much more quickly and thoroughly than people can. This has allowed SETI efforts to cover more ground while also greatly reducing the number of false positive signals.

Another example is the search for exoplanets. Astronomers discovered most of the 5,300 known exoplanets by measuring a dip in the amount of light coming from a star when a planet passes in front of it. AI tools can now pick out the signs of an exoplanet with 96% accuracy.

AI tools can help astronomers discover new exoplanets like TRAPPIST-1 b.

NASA, ESA, CSA, Joseph Olmsted (STScI), CC BY

Making new discoveries

AI has proved itself to be excellent at identifying known objects – like galaxies or exoplanets – that astronomers tell it to look for. But it is also quite powerful at finding objects or phenomena that are theorized but have not yet been discovered in the real world.

Teams have used this approach to detect new exoplanets, learn about the ancestral stars that led to the formation and growth of the Milky Way, and predict the signatures of new types of gravitational waves.

To do this, astronomers first use AI to convert theoretical models into observational signatures – including realistic levels of noise. They then use machine learning to sharpen the ability of AI to detect the predicted phenomena.

Finally, radio astronomers have also been using AI algorithms to sift through signals that don’t correspond to known phenomena. Recently a team from South Africa found a unique object that may be a remnant of the explosive merging of two supermassive black holes. If this proves to be true, the data will allow a new test of general relativity – Albert Einstein’s description of space-time.

Image: Medeiros et al 2023, CC BY-ND

The team that first imaged a black hole, at left, used AI to generate a sharper version of the image, at right, showing the black hole to be larger than originally thought.

Medeiros et al 2023, CC BY-ND

Making predictions and plugging holes

As in many areas of life recently, generative AI and large language models like ChatGPT are also making waves in the astronomy world.

The team that created the first image of a black hole in 2019 used a generative AI to produce its new image. To do so, it first taught an AI how to recognize black holes by feeding it simulations of many kinds of black holes. Then, the team used the AI model it had built to fill in gaps in the massive amount of data collected by the radio telescopes on the black hole M87.

Using this simulated data, the team was able to create a new image that is two times sharper than the original and is fully consistent with the predictions of general relativity.

Astronomers are also turning to AI to help tame the complexity of modern research. A team from the Harvard-Smithsonian Center for Astrophysics created a language model called astroBERT to read and organize 15 million scientific papers on astronomy. Another team, based at NASA, has even proposed using AI to prioritize astronomy projects, a process that astronomers engage in every 10 years.

As AI has progressed, it has become an essential tool for astronomers. As telescopes get better, as data sets get larger and as AIs continue to improve, it is likely that this technology will play a central role in future discoveries about the universe.

Want to know more about AI, chatbots, and the future of machine learning? Check out our full coverage of artificial intelligence, or browse our guides to The Best Free AI Art Generators and Everything We Know About OpenAI’s ChatGPT.

Chris Impey, University Distinguished Professor of Astronomy, University of Arizona

This article is republished from The Conversation under a Creative Commons license. Read the original article.

[insight-analysis]

Life over earth atmosphere: Microbes covered with Sky

#Astronomy, #Astrophysics, #Atmosphere, #Cosmology, #Cosmos, #Creatures, #Living, #Microbes, #Microorganisms, #Microscopic, #Mystery, #Physics, #Science, #Scientist, #Space, #Stratosphere, #Universe

[eli-kittim]

Science & God’s Existence

By Author Eli Kittim

Can We Reject Paul’s Vision Based On the Fact that No One Saw It?

Given that none of Paul’s companions saw or heard the content of his visionary experience (Acts 9), on the road to Damascus, some critics have argued that it must be rejected as unreliable and inauthentic. Let’s test that hypothesis. Thoughts are common to all human beings. Are they not? However, no one can “prove” that they have thoughts. That doesn’t mean that they don’t have any. Just because others can’t see or hear your thoughts doesn’t mean they don’t exist. Absence of evidence is not evidence of absence. Obviously, a vision, by definition, is called a “vision” precisely because it is neither seen nor observed by others. So, this preoccupation with “evidence” and “scientism” has gone too far. We demand proof for things that are real but cannot be proven. According to philosopher William Lane Craig, the irony is that science can’t even prove the existence of the external world, even though it presupposes it.

No one has ever seen an electron, or the substance we call “dark matter,” yet physicists presuppose them. Up until recently we could not see, under any circumstances, ultraviolet rays, X – rays, or gamma rays. Does that mean they didn’t exist before their detection? Of course not. Recently, with the advent of better instruments and technology we are able to detect what was once invisible to the human eye. Gamma rays were first observed in 1900. Ultraviolet rays were discovered in 1801. X-rays were discovered in 1895. So, PRIOR to the 19th century, no one could see these types of electromagnetic radiation with either the naked eye or by using microscopes, telescopes, or any other available instruments. Prior to the 19th century, these phenomena could not be established. Today, however, they are established as facts. What made the difference? Technology (new instruments)!

If you could go back in time to Ancient Greece and tell people that in the future they could sit at home and have face-to-face conversations with people who are actually thousands of miles away, would they have believed you? According to the empirical model of that day, this would have been utterly impossible! It would have been considered science fiction. My point is that what we cannot see today with the naked eye might be seen or detected tomorrow by means of newer, more sophisticated technologies!

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Can We Use The Scientific Model to Address Metaphysical Questions?

Using empirical methods of “observation” to determine what is true and what is false is a very *simplistic* way of understanding reality in all its complexity. For example, we don’t experience 10 dimensions of reality. We only experience a 3-dimensional world, with time functioning as a 4th dimension. Yet Quantum physics tells us there are, at least, 10 dimensions to reality: https://www.google.com/amp/s/phys.org/news/2014-12-universe-dimensions.amp

Prior to the discoveries of primitive microscopes, in the 17th century, you couldn’t see germs, bacteria, viruses, or microorganisms with the naked eye! For all intents and purposes, these microorganisms DID NOT EXIST! It would therefore be quite wrong to assume that, because a large number of people (i.e. a consensus) cannot see it, an unobservable phenomenon must be ipso facto nonexistent.

Similarly, prophetic experiences (e.g. visions) cannot be tested by any instruments of modern technology, nor investigated by the methods of science. Because prophetic experiences are of a different kind, the assumption that they do not have objective reality is a hermeneutical mistake that leads to a false conclusion. Physical phenomena are perceived by the senses, whereas metaphysical phenomena are not perceived by the senses but rather by pure consciousness. Therefore, if we use the same criteria for metaphysical perceptions that we use for physical ones (which are derived exclusively from the senses), that would be mixing apples and oranges. The hermeneutical mistake is to use empirical observation (that only tests physical phenomena) as “a standard” for testing the truth value of metaphysical phenomena. In other words, the criteria used to measure physical phenomena are quite inappropriate and wholly inapplicable to their metaphysical counterparts.

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Are the “Facts” of Science the Only Truth, While All Else is Illusion?

Whoever said that scientific “facts” are *necessarily* true? On the contrary, according to Bertrand Russell and Immanuel Kant, only a priori statements are *necessarily* true (i.e. logical & mathematical propositions), which are not derived from the senses! The senses can be deceptive. That’s why every 100 years or so new “facts” are discovered that replace old ones. So what happened to the old facts? Well, they were not necessarily true in the epistemological sense. And this process keeps repeating seemingly ad infinitum. If that is the case, how then can we trust the empirical model, devote ourselves to its shrines of truth, and worship at its temples (universities)? Read the “The Structure of Scientific Revolutions” by Thomas Kuhn, a classic book on the history of science and how scientific paradigms change over time.

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Cosmology, Modern Astronomy, & Philosophy Seem to Point to the Existence of God

If you studied cosmology and modern astronomy, you would be astounded by the amazing beauty, order, structure, and precision of the various movements of the planets and stars. The Big Bang Theory is the current cosmological model which asserts that the universe had a beginning. Astoundingly, the very first line of the Bible (the opening sentence, i.e. Gen. 1.1) makes the exact same assertion. The fine tuning argument demonstrates how the slightest change to any of the fundamental physical constants would have changed the course of history so that the evolution of the universe would not have proceeded in the way that it did, and life itself would not have existed. What is more, the cosmological argument demonstrates the existence of a “first cause,” which can be inferred via the concept of causation. This is not unlike Leibniz’ “principle of sufficient reason” nor unlike Parmenides’ “nothing comes from nothing” (Gk. οὐδὲν ἐξ οὐδενός; Lat. ex nihilo nihil fit)! All these arguments demonstrate that there must be a cosmic intelligence (i.e. a necessary being) that designed and sustained the universe.

We live in an incredibly complex and mysterious universe that we sometimes take for granted. Let me explain. The Earth is constantly traveling at 67,000 miles per hour and doesn’t collide with anything. Think about how fast that is. The speed of an average bullet is approximately 1,700 mph. And the Earth’s speed is 67,000 mph! That’s mind-boggling! Moreover, the Earth rotates roughly 1,000 miles per hour, yet you don’t fall off the grid, nor do you feel this gyration because of gravity. And I’m not even discussing the ontological implications of the enormous information-processing capacity of the human brain, its ability to invent concepts, its tremendous intelligence in the fields of philosophy, mathematics, and the sciences, and its modern technological innovations.

It is therefore disingenuous to reduce this incredibly complex and extraordinarily deep existence to simplistic formulas and pseudoscientific oversimplifications. As I said earlier, science cannot even “prove” the existence of the external world, much less the presence of a transcendent one. The logical positivist Ludwig Wittgenstein said that metaphysical questions are unanswerable by science. Yet atheist critics are incessantly comparing Paul’s and Jesus’ “experiences” to the scientific model, and even classifying them as deliberate literary falsehoods made to pass as facts because they don’t meet scholarly and academic parameters. The present paper has tried to show that this is a bogus argument! It does not simply question the “epistemological adequacy” of atheistic philosophies, but rather the methodological (and therefore epistemic) legitimacy of the atheist program per se.

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[lorensteffy]

Mirror Images: George and Cynthia

Mirror Images: George and Cynthia

A staff member at the Giant Magellan Telescope’s Mirror Lab places the last piece of glass into the mold for one of the massive mirrors, similar to those nicknamed “George” and “Cynthia.” (Photo: Giant Magellan Telescope Mirror Lab)

George Mitchell is known for perfecting the drilling process known as hydraulic fracturing, or fracking, and for his pioneering work in sustainable development. Less…

[indrosphere]

Chandrayaan-2 | We’re proud of ISRO

Chandrayaan-2 | We’re proud of ISRO. You have won our hearts. Kudos to your efforts. Jai Hind! #IndiaWithISRO

The Chandrayaan-2 mission serves as the second phase of India’s Chandrayaan lunar exploration program and is a follow-on to the highly successful Chandrayaan-1 mission, which featured a lunar orbiter and an impactor known as the Moon Impact Probe (MIP). Both spacecraft were launched aboard a Polar Satellite Launch Vehicle (PSLV) on October 22, 2008, and they discovered water ice at the lunar…

[shmosnet2]

Where Do Black Holes Lead?

Where Do Black Holes Lead?

Where does a black hole go? So there you are, about to leap into a black hole. What could possibly await should — against all odds — you somehow survive? Where would you end up and what tantalizing tales would you be able to regale if you managed to clamor your way back? The simple answer to all of these questions is, as Professor Richard Massey explains, "Who knows?" As a Royal Society research fellow at the Institute for Computational Cosmology at Durham University, Massey is fully aware that the mysteries of black holes run deep. "Falling through an event horizon is literally passing beyond the veil — once someone falls past it, nobody could ever send a message back," he said. "They'd be ripped to pieces by the enormous gravity, so I doubt anyone falling through would get anywhere." If that sounds like a disappointing — and painful — answer, then it is to be expected. Ever since Albert Einstein's general theory of relativity was considered to have predicted black holes by linking space-time with the action of gravity, it has been known that black holes result from the death of a massive star leaving behind a small, dense remnant core. Assuming this core has more than roughly three-times the mass of the sun, gravity would overwhelm to such a degree that it would fall in on itself into a single point, or singularity, understood to be the black hole's infinitely dense core. Related: 9 Ideas About Black Holes That Will Blow Your Mind CLOSE The resulting uninhabitable black hole would have such a powerful gravitational pull that not even light could avoid it. So, should you then find yourself at the event horizon — the point at which light and matter can only pass inward, as proposed by the German astronomer Karl Schwarzschild — there is no escape. According to Massey, tidal forces would reduce your body into strands of atoms (or 'spaghettification', as it is also known) and the object would eventually end up crushed at the singularity. The idea that you could pop out somewhere — perhaps at the other side — seems utterly fantastical. What about a wormhole? Or is it? Over the years scientists have looked into the possibility that black holes could be wormholes to other galaxies. They may even be, as some have suggested, a path to another universe. Such an idea has been floating around for some time: Einstein teamed up with Nathan Rosen to theorise bridges that connect two different points in space-time in 1935. But it gained some fresh ground in the 1980s when physicist Kip Thorne — one of the world's leading experts on the astrophysical implications of Einstein's general theory of relativity — raised a discussion about whether objects could physically travel through them. "Reading Kip Thorne's popular book about wormholes is what first got me excited about physics as a child," Massey said. But it doesn't seem likely that wormholes exist. Indeed, Thorne, who lent his expert advice to the production team for the Hollywood movie Interstellar, wrote: "We see no objects in our universe that could become wormholes as they age," in his book "The Science of Interstellar" (W.W. Norton and Company, 2014). Thorne told Space.com that journeys through these theoretical tunnels would most likely remain science fiction, and there is certainly no firm evidence that a black hole could allow for such a passage. Artist's concept of a wormhole. If wormholes exist, they might lead to another universe. But, there's no evidence that wormholes are real or that a black hole would act like one. (Image credit: Shutterstock) But, the problem is that we can't get up close to see for ourselves. Why, we can't even take photographs of anything that takes place inside a black hole — if light cannot escape their immense gravity, then nothing can be snapped by a camera. As it stands, theory suggests that anything which goes beyond the event horizon is simply added to the black hole and, what's more, because time distorts close to this boundary, this will appear to take place incredibly slowly, so answers won't be quickly forthcoming. "I think the standard story is that they lead to the end of time," said Douglas Finkbeiner, professor of astronomy and physics at Harvard University. "An observer far away will not see their astronaut friend fall into the black hole. They'll just get redder and fainter as they approach the event horizon [as a result of gravitational red shift]. But the friend falls right in, to a place beyond 'forever.' Whatever that means." Maybe a black hole leads to a white hole Certainly, if black holes do lead to another part of a galaxy or another universe, there would need to be something opposite to them on the other side. Could this be a white hole — a theory put forward by Russian cosmologist Igor Novikov in 1964? Novikov proposed that a black hole links to a white hole that exists in the past. Unlike a black hole, a white hole will allow light and matter to leave, but light and matter will not be able to enter. Scientists have continued to explore the potential connection between black and white holes. In their 2014 study published in the journal Physical Review D, physicists Carlo Rovelli and Hal M. Haggard claimed that "there is a classic metric satisfying the Einstein equations outside a finite space-time region where matter collapses into a black hole and then emerges from a while hole." In other words, all of the material black holes have swallowed could be spewed out, and black holes may become white holes when they die. Far from destroying the information that it absorbs, the collapse of a black hole would be halted. It would instead experience a quantum bounce, allowing information to escape. Should this be the case, it would shed some light on a proposal by former Cambridge University cosmologist and theoretical physicist Stephen Hawking who, in the 1970s, explored the possibility that black holes emit particles and radiation — thermal heat — as a result of quantum fluctuations. "Hawking said a black hole doesn't last forever," Finkbeiner said. Hawking calculated that the radiation would cause a black hole to lose energy, shrink and disappear, as described in his 1976 paper published in Physical Review D. Given his claims that the radiation emitted would be random and contain no information about what had fallen in, the black hole, upon its explosion, would erase loads of information. This meant Hawking's idea was at odds with quantum theory, which says information can't be destroyed. Physics states information just becomes more difficult to find because, should it become lost, it becomes impossible to know the past or the future. Hawking's idea led to the 'black hole information paradox' and it has long puzzled scientists. Some have said Hawking was simply wrong, and the man himself even declared he had made an error during a scientific conference in Dublin in 2004. So, do we go back to the concept of black holes emitting preserved information and throwing it back out via a white hole? Maybe. In their 2013 study published in Physical Review Letters, Jorge Pullin at Louisiana State University and Rodolfo Gambini at the University of the Republic in Montevideo, Uruguay, applied loop quantum gravity to a black hole and found that gravity increased towards the core but reduced and plonked whatever was entering into another region of the universe. The results gave extra credence to the idea of black holes serving as a portal. In this study, singularity does not exist, and so it doesn't form an impenetrable barrier that ends up crushing whatever it encounters. It also means that information doesn't disappear. Maybe black holes go nowhere Yet physicists Ahmed Almheiri, Donald Marolf, Joseph Polchinski and James Sully still believed Hawking could have been on to something. They worked on a theory that became known as the AMPS firewall, or the black hole firewall hypothesis. By their calculations, quantum mechanics could feasibly turn the event horizon into a giant wall of fire and anything coming into contact would burn in an instant. In that sense, black holes lead nowhere because nothing could ever get inside. This, however, violates Einstein's general theory of relativity. Someone crossing the event horizon shouldn't actually feel any great hardship because an object would be in free fall and, based on the equivalence principle, that object — or person — would not feel the extreme effects of gravity. It could follow the laws of physics present elsewhere in the universe, but even if it didn't go against Einstein's principle it would undermine quantum field theory or suggest information can be lost. Related: 11 Fascinating Facts About Our Milky Way GalaxyArtist's impression of a tidal disruption event which occurs when a star passes too close to a supermassive black hole. (Image credit: All About Space magazine) A black hole of uncertainty Step forward Hawking once more. In 2014, he published a study in which he eschewed the existence of an event horizon — meaning there is nothing there to burn — saying gravitational collapse would produce an 'apparent horizon' instead. This horizon would suspend light rays trying to move away from the core of the black hole, and would persist for a "period of time." In his rethinking, apparent horizons temporarily retain matter and energy before dissolving and releasing them later down the line. This explanation best fits with quantum theory — which says information can't be destroyed — and, if it was ever proven, it suggests that anything could escape from a black hole. Hawking went as far as saying black holes may not even exist. "Black holes should be redefined as metastable bound states of the gravitational field," he wrote. There would be no singularity, and while the apparent field would move inwards due to gravity, it would never reach the center and be consolidated within a dense mass. And yet anything which is emitted will not be in the form of the information swallowed. It would be impossible to figure out what went in by looking at what is coming out, which causes problems of its own — not least for, say, a human who found themselves in such an alarming position. They'd never feel the same again! One thing's for sure, this particular mystery is going to swallow up many more scientific hours for a long time to come. Rovelli and Francesca Vidotto recently suggested that a component of dark matter could be formed by remnants of evaporated black holes, and Hawking's paper on black holes and 'soft hair' was released in 2018, and describes how zero-energy particles are left around the point of no return, the event horizon — an idea that suggests information is not lost but captured. This flew in the face of the no-hair theorem which was expressed by physicist John Archibald Wheeler and worked on the basis that two black holes would be indistinguishable to an observer because none of the special particle physics pseudo-charges would be conserved. It's an idea that has got scientists talking, but there is some way to go before it's seen as the answer for where black holes lead. If only we could find a way to leap into one.

https://ift.tt/2stoz06 . Foreign Articles December 02, 2019 at 04:13AM

[age-of-the-geek]

Perseids, a Meteor Shower Famous For Its Fireballs, Is Peaking Tomorrow. This is really cool guys and tonight is the last night so check it out. https://www.sciencealert.com/one-of-the-best-meteor-showers-the-perseids-are-peaking-tomorrow-2019/amp #science #space #beauty #interstellar #cosmos #hst #bibletext #universe #creation #bible #hubblehangout #roskosmos #astronomy #constellation #naturelovers #hubbletelescope #nasa #galaxy #chandra #cosmology #nature #scripture #amazing #hubble #nasabeyond https://www.instagram.com/p/B1EHm3iH6Aj/?igshid=lnhg6f16hjk9

[bunchoffaceclaims]

Jessica Pimentel

Gender: Female

DOB: Unknown

Nationality: American

Ethnicity: Dominican-Taíno

Gif Hunt tag

Born and raised in Brooklyn, New York, Jessica Pimentel is an American actress whose parents were immigrants from the Dominican Republic. She is a graduate of the High School for the Performing Arts (a.k.a. "Fame") in New York City and the prestigious American Academy of Dramatic Arts, also in New York City, where she holds a degree in Theater Arts where she was awarded the Cleavon Little scholarship and was a member of the professional acting company. She has traveled around the United States, Canada and Japan as both a classical violinist and Hardcore/ Heavy Metal musician and has played at various notable venues such as CBGB and Carnegie Hall. Jessica is also the lead vocalist and recording guitarist for the Brooklyn, NY based heavy metal band Alekhine's Gun and Bassist for NY heavy metal/ Hardcore band Desolate. She is a featured and endorsed artist for Spector basses, Halo guitars and Krank Amps. She is also a student of many styles of dance and martial arts. She is a lover of mathematics and science (cosmology, astronomy, physics and chemistry) and a student of theology and Tibetan Buddhist philosophy, logic, debate and meditation in the Gelugpa Tradition of the Dalai Lama and was trained by the former abbot of Sera Mey Monastery, H.E. Sermey Khensur Rinpoche Lobsang Tharchin. Some of her theater credits include the American Stage production of the Pulitzer prize winning play 'Anna in the Tropics' and the Shakespeare Theater's production of a 'A Very Old Man With Enormous Wings' adapted by Nilo Cruz. She was also seen in the leading role of Mathilde in the Wellfleet Harbor Actors Theater's production of 'The Clean House' by Sarah Ruhl and the Seattle Repertory Theater's production of Eduardo Machado's 'The Cook' which dealt with the effects of the rise of communism in Cuba over a span of 40 years. In 2008 she played the role of Juliet in an abridged, contemporary version of 'Romeo and Juliet' in a Theatreworks USA production national tour and originated the role of Lupita in the off Broadway show sponsored by The Women's Project 'Aliens with Extraordinary Skills' by Romanian playwright Saviana Stanescu.

[jcmarchi]

Webb unlocks secrets of primeval galaxy - Technology Org

New Post has been published on https://thedigitalinsider.com/webb-unlocks-secrets-of-primeval-galaxy-technology-org/

Webb unlocks secrets of primeval galaxy - Technology Org

Looking deep into space and time, two teams using the NASA/ESA/CSA James Webb Space Telescope have studied the exceptionally luminous galaxy GN-z11, which existed when our 13.8 billion-year-old Universe was only about 430 million years old.

GN-z11 in the GOODS-North field

Delivering on its promise to transform our understanding of the early Universe, the James Webb Space Telescope is probing galaxies near the dawn of time. One of these is the exceptionally luminous galaxy GN-z11, which existed when the Universe was just a tiny fraction of its current age. Initially detected with the NASA/ESA Hubble Space Telescope, it is one of the youngest and most distant galaxies ever observed, and it is also one of the most enigmatic. Why is it so bright? Webb appears to have found the answer.

A team studying GN-z11 with Webb found the first clear evidence that the galaxy is hosting a central, supermassive black hole that is rapidly accreting matter. Their finding makes this the most distant active supermassive black hole spotted to date.

“We found extremely dense gas that is common in the vicinity of supermassive black holes accreting gas,” explained principal investigator Roberto Maiolino of the Cavendish Laboratory and the Kavli Institute of Cosmology at the University of Cambridge in the United Kingdom. “These were the first clear signatures that GN-z11 is hosting a black hole that is gobbling matter.”

Using Webb, the team also found indications of ionised chemical elements typically observed near accreting supermassive black holes. Additionally, they discovered that the galaxy is expelling a very powerful wind. Such high-velocity winds are typically driven by processes associated with vigorously accreting supermassive black holes.

Spectrum of GN-z11

“Webb’s NIRCam (Near-Infrared Camera) has revealed an extended component, tracing the host galaxy, and a central, compact source whose colours are consistent with those of an accretion disc surrounding a black hole,” said investigator Hannah Übler, also of the Cavendish Laboratory and the Kavli Institute.

Together, this evidence shows that GN-z11 hosts a two-million-solar-mass, supermassive black hole in a very active phase of consuming matter, which is why it’s so luminous.

A second team, also led by Maiolino, used Webb’s NIRSpec (Near-Infrared Spectrograph) to find a gaseous clump of helium in the halo surrounding GN-z11.

“The fact that we don’t see anything else beyond helium suggests that this clump must be fairly pristine,” said Roberto. “This is something that was expected by theory and simulations in the vicinity of particularly massive galaxies from these epochs – that there should be pockets of pristine gas surviving in the halo, and these may collapse and form Population III star clusters.”

Finding the so far unseen Population III stars [1] – the first generation of stars formed almost entirely from hydrogen and helium – is one of the most important goals of modern astrophysics. These stars are expected to be very massive, very luminous, and very hot. Their signature would be the presence of ionised helium and the absence of chemical elements heavier than helium.

GN-z11 in the GOODS-North field (compass image)

The formation of the first stars and galaxies marks a fundamental shift in cosmic history, during which the Universe evolved from a dark and relatively simple state into the highly structured and complex environment we see today.

In future Webb observations, Roberto, Hannah, and their team will explore GN-z11 in greater depth, and they hope to strengthen the case for the Population III stars that may be forming in its halo.

The research on the pristine gas clump in GN-z11’s halo has been accepted for publication in Astronomy & Astrophysics. The results of the study of GN-z11’s black hole were published in the journal Nature.

Notes [1] The name Population III arose because astronomers had already classified the stars of the Milky Way as Population I (stars like the Sun, which are rich in heavier elements) and Population II (older stars with a low heavy-element content, found in the Milky Way bulge and halo, and in globular star clusters).

Source: European Space Agency

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[insight-analysis]

Surely You're Joking, Mr. Feynman!

#Astronomy, #Bestseller, #Bill_Gates, #Book, #Cosmologist, #Cosmology, #Cosmos, #Feynman, #Learning, #Life, #Physicist, #Physics, #Published, #Richard, #Science, #Scientist, #Space, #Storyteller, #Teach

[revelatorytruths]

Classification of Matter

Matter in all universes, excepting in the central universe, is identical. Matter in its physical properties depends on the revolutionary rates of its component members, the number and size of the revolving members, their distance from the nuclear body or the space content of matter, as well as on the presence of certain forces as yet undiscovered on our planet Urantia.

In the varied suns,…

[periklislivas-blog]

Neutron star merger confirms decades of predictions by Princeton researchers

Neutron star merger confirms decades of predictions by Princeton researchers

On Aug. 17, the Laser Interferometry Gravitational-Wave Observatory (LIGO) detected the fifth fingerprint of a massive disturbance in spacetime since LIGO began operations in September 2015. Unlike the first four sets of ripples, which reflected collisions between two black holes, the shape of these spacetime distortions suggested a collision between two neutron stars.

While black hole collisions…

[wigmund]

From SpaceTelescope.Org Picture of the Week; October 24, 2011:

Hubble Sizes Up A Dwarf Galaxy

The NASA/ESA Hubble Space Telescope has taken this image of the Phoenix Dwarf Galaxy, which is located 1.4 million light-years away from Earth. It is located in the constellation of Phoenix in the southern sky. The object, a dwarf irregular galaxy, features younger stars in its inner regions and older ones at its outskirts.

Dwarf galaxies are small galaxies composed of a few billion stars, compared to fully-fledged galaxies which can contain hundreds of billions of stars. In the Local Group, there are a number of such dwarf galaxies orbiting the larger galaxies such as the Milky Way or the Andromeda Galaxy. They are thought to have been created by tidal forces in the early stages of the creation of these galaxies, or as a result of collisions between galaxies, forming from ejected streams of material and dark matter from the parent galaxies. The Milky Way galaxy features at least 14 satellite dwarf galaxies orbiting it.

Because of their shape, dwarf irregulars have often been mistaken for globular clusters: they do not feature a bulge or spiral arms like larger galaxies. However, their importance in terms of cosmology is in stark contrast to their unspectacular shapes, as their chemical makeup and high levels of gas are believed to be similar to those of the earliest galaxies that populated the Universe. They are thought to be contemporary versions of some of the remote galaxies observed in deep field galaxy surveys, and can thus help to understand the early stages of galaxy and star formation in the young Universe.

The galaxy was discovered in 1976 by Hans-Emil Schuster and Richard Martin West. Hans-Emil Schuster was acting director of ESO’s La Silla Observatory in Chile and was involved in the selection and testing of the sites for the observatories of both La Silla and Paranal. His great contribution to astronomy and to ESO was recognised by the Chilean government last week when he was awarded the medal of the Order of Bernardo O’Higgins.

Credit: ESA/Hubble & NASA

[insight-analysis]

“The Demon-Haunted World: Science as a Candle in the Darkness ", book by Carl Sagan

#Astronomy, #Author, #Book, #Carl_Sagan, #Contribution, #Cosmology, #Cosmos, #Demon, #Dragon, #Hypothesis, #Physics, #Pseudo, #Pseudo_Scientific, #Sagan, #Science, #Scientific, #Space, #Theory

[revelatorytruths]

Our World Urantia  Our world, Urantia, is one of many similar inhabited planets which comprise the local universe of…