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Category: cosmology – Page 81

A superfluid vortex controlled in a lab is helping physicists learn more about the behavior of black holes.

A whirlpool generated in helium cooled to just a fraction above absolute zero mimics the gravitational environment of these objects to such high precision that it’s giving unprecedented insight into how they drag and warp the space-time around them.

“Using superfluid helium has allowed us to study tiny surface waves in greater detail and accuracy than with our previous experiments in water,” explains physicist Patrik Švančara of the University of Nottingham in the UK, who led the research.

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Scientists have referred to black holes as cosmic objects that consume whatever comes into them but do not allow anything to escape from the inside. Stephen Hawking assumes that a black hole could be a portal to another universe. While addressing about 1,000 people at Harvard in 2015, Hawkings analyzed the groundbreaking theory with these words.

“Blackholes aren’t the eternal prisons they were once thought. Things can get out of a black hole, both from the outside and possibly through another universe. So, if you ever feel you’re in a black hole, don’t give up. There’s a way out.”

Scientists listening to the renowned astrophysicist were fascinated with his explanations. Keep in mind that Stephen Hawkings came up with Hawking’s radiation theory which revolutionized our understanding of black holes. According to this theory, Black holes thermally generate and emit subatomic particles until they lose their energy and proceed to evaporate. Based on this theory, Hawkings says that black holes are not entirely black and they don’t last for eternity.

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The new map includes around 1.3 million quasars from across the visible universe and could help scientists better understand the properties of dark matter.

Astronomers have charted the largest-ever volume of the universe with a new map of active supermassive black holes living at the centers of galaxies. Called quasars, the gas-gobbling black holes are, ironically, some of the universe’s brightest objects.

The new map logs the location of about 1.3 million quasars in space and time, the furthest of which shone bright when the universe was only 1.5 billion years old. (For comparison, the universe is now 13.7 billion years old.)

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It takes more than a galaxy merger to make a black hole grow and new stars form: machine learning shows cold gas is needed too to initiate rapid growth — new research finds.

When they are active, supermassive black holes play a crucial role in the way galaxies evolve. Until now, growth was thought to be triggered by the violent collision of two galaxies followed by their merger, however new research led by the University of Bath suggests galaxy mergers alone are not enough to fuel a black hole — a reservoir of cold gas at the centre the host galaxy is needed too.

The new study, published this week in the journal Monthly Notices of the Royal Astronomical Society is believed to be the first to use machine learning to classify galaxy mergers with the specific aim of exploring the relationship between galaxy mergers, supermassive black-hole accretion and star formation. Until now, mergers were classified (often incorrectly) through human observation alone.

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At some point, theoretical physics shades into science fiction. This is a beautiful little book, by a celebrated physicist and writer, about a phenomenon that is permitted by equations but might not actually exist. Or perhaps white holes do exist, and are everywhere: we just haven’t noticed them yet. No such controversy exists about black holes, wh…

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Dive into the captivating story of Gz9p3, an ancient galaxy that’s challenging our understanding of the cosmos. Revealed by the James Webb Space Telescope, this galactic giant, observed just 510 million years after the Big Bang, is reshaping our views on early universe galactic formation. Join us as we explore the mysteries and wonders of Gz9p3, a window into the universe’s dawn.

Chapters:
00:00 Introduction.
00:54 Unveiling Gz9p3: A Glimpse into the Past.
03:16 Cosmic Collisions: Sculpting Galaxies.
05:03 Rethinking Early Universe Cosmology.
06:25 Outro.
07:13 Enjoy.

Best Telescopes for beginners:
Celestron 70mm Travel Scope.
https://amzn.to/3jBi3yY

Celestron 114LCM Computerized Newtonian Telescope.

Continue reading “Older Than Time? Speck of light glimpsed by Hubble is truly an enormous old galaxy, JWST reveals” | >