The first-ever image of a black hole's shadow has been revealed. NASA telescopes helped characterize the black hole's environment.
A black hole and its shadow have been captured in an image for the first time, a historic feat by an international network of radio telescopes called the Event Horizon Telescope (EHT) . EHT is an international collaboration whose support in the U.S. includes the National Science Foundation .
A black hole is an extremely dense object from which no light can escape. Anything that comes within a black hole's "event horizon," its point of no return, will be consumed, never to re-emerge, because of the black hole's unimaginably strong gravity. By its very nature, a black hole cannot be seen, but the hot disk of material that encircles it shines bright. Against a bright backdrop, such as this disk, a black hole appears to cast a shadow.
Not to change the topic here:
This 13-Billion-Year-Old Supermassive Black Hole Is the Oldest Ever Found | Smart News |
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Astronomers have spotted the oldest and most distant supermassive black hole ever discovered, reports CNET ’s Jackson Ryan.
Black holes, ravenous nothings with gravitational pulls so strong even light cannot escape, render themselves invisible by their very nature. But, somewhat paradoxically, the most massive black holes create the brightest objects in the universe, brilliant discs of swirling light and matter known as quasars, as they suck down anything that gets too close.
Bad Astronomy | Magnetic fields can draw energy out of a black hole's spin
One of the defining characteristics of a black hole is that nothing can come out of them. That's why they're named such; they're like an infinitely deep pit, and not even light can escape. A hole that's black .
But, like so many ideas in science, when you take a closer look, that absolute statement becomes a bit relative . You can get something out of a black hole: Energy. And, it turns out, you can get a lot. Like, a lot a lot.
A new paper has come out showing how magnetic fields can be used to extract huge amounts of energy from a black hole , and may power some astrophysical phenomena we see around them. It's not exactly easy, and it's not like you'll be able to charge up your phone or heat your house with this technique (more like you'd vaporize them down to their constituent subatomic particles which would then be accelerated outwards at very near the speed of light * ), but it's still extremely cool.
Massive Stellar Triples Leading to Sequential Binary Black-Hole Mergers
Time evolution of massive stellar triples: The figure illustrates compact stars in blue, standard evolving stars with red envelopes, black holes in black and merging binary black holes with a surrounding swirl. Black holes formed as sequential mergers are labeled “SM.” Top: the outer tertiary is the most massive star in the system and forms the first black hole in this triple.
Astronomers consider metals to be all elements except hydrogen and helium. Low metallicity environments are those in which hydrogen and helium compose more than approximately 99% of matter. Scientists believe that rare compact stars exist in low metallicity environments. In these environments, rapid rotation and mixing stir the stellar fuel and restrict chemically homogeneously-evolving stars from expanding.
Quite a lot has been going on:
Physicists Propose New Way to Extract Energy from Black Holes | Astronomy, Physics | Sci-News.com
Spinning black holes store rotational energy that can be extracted; when a black hole is immersed in an externally supplied magnetic field, reconnection of magnetic field lines within the ergosphere can generate negative energy particles that fall into the black hole event horizon while the other accelerated particles escape stealing energy from the black hole.
Rotational energy can be extracted from spinning black holes through magnetic reconnection. Image credit: Sci-News.com.
Black hole bombshell: Scientist picked up 'unexplainable rumble' at centre of Milky Way | Science
But YouTube channel ‘SpaceRip’ revealed in their documentary ‘The Most Powerful Black Holes in the Universe’ how a discovery a few years later put scientists on high alert.
The narrator said: “Models suggest there could be as many as a billion black holes in our Milky Way alone.
“Yet they are dwarfed by a far larger and far more powerful presence lurking in the very core of the galaxy.
'Oldest and biggest' black hole discovered in galaxy | World | The Times
Weighing as much as 100 billion suns and located in an environment where temperatures are thought to reach a sizzling 100 million Celsius, the object at the centre of the galaxy cluster Abell 2261 should, one might think, be fairly easy to find.
Hicks reappointed to chair 'Black Hole' subcommittee | Local News | timesnews.net
Happening on Twitter
In this simulation, a black hole's intense gravity warps the image of the disk of hot, glowing gas surrounding it.… https://t.co/hjAqBFQktY ScienceMagazine (from Washington, DC & Cambridge, UK) Fri Jan 15 05:30:20 +0000 2021
The gravity of a black hole is so intense, it distorts its surroundings, like those carnival mirrors that distort r… https://t.co/CcNUyA5HU8 csa_asc (from Saint-Hubert, Quebec, Canada) Wed Jan 20 15:00:02 +0000 2021
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