Black Holes part 4

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Message 2019103 - Posted: 15 Nov 2019, 10:56:44 UTC - in response to Message 2019083.  

Nothing is suppose to escape from a black hole???
From inside the event horizon. Star didn't make it inside.
More likely it got 1 hell of a gravitational mega slingshot effect applied to it instead.

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Message 2019129 - Posted: 15 Nov 2019, 15:50:24 UTC

The gravity of these super massive black holes is staggering. I read of 1 with the mass of 40 billion suns.
How can a human grasp such an enormous mass? If the earth was a black hole, it would be the size of a peanut.
If our sun were a black hole it would be the size of New York city.
A 40 billion mass black hole is the diameter of the solar system.

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Message 2019245 - Posted: 16 Nov 2019, 12:07:58 UTC

Black Holes.

A Star Ejected from the Milky Way's 'Heart of Darkness' Has Reached a Mind-Blowing Speed

16 November 2019

As humankind's ancestors were learning to walk upright, a star was launched from the supermassive black hole at the center of our galaxy at a staggering 3.7 million mph (6 million km/h).

Five million years after this dramatic ejection, a group of researchers, led by Sergey Koposov of Carnegie Mellon University's McWilliams Center for Cosmology, has spotted the star, known as S5-HVS1, in the Crane-shaped constellation Grus. The star was spotted traveling relatively close to Earth (29,000 light-years away) at unprecedented, searing speeds — about 10 times faster than most stars in our galaxy.

"The velocity of the discovered star is so high that it will inevitably leave the galaxy and never return," Douglas Boubert, a researcher at the University of Oxford and a co-author on the study, said in a statement.

https://www.space.com/star-ejected-milky-way-black-hole-superfast-speed.html

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Message 2019247 - Posted: 16 Nov 2019, 12:15:28 UTC

I don't know if has been posted before? but sounds interesting. I hope I pick the right thread?

European physicists propose huge underground gravitational-wave laboratory

14 Nov 2019 Michael Banks

Physicists from across Europe have revealed plans for a huge underground gravitational-wave observatory that, if funded, could be operational by the mid-2030s. The European Laboratory for Gravitational and Atom-interferometric Research (ELGAR) could be located in either France or Italy and would cost around €200m to build. Those involved in the project have now applied for European funding to carry out a detailed design and cost for the facility.

Gravitational waves are ripples in space-time that were predicted over 100 years ago by Albert Einstein. In 2015 the twin Advanced Laser Interferometer Gravitational-wave Observatory (aLIGO) in the US along with the Virgo gravitational-wave detector in Italy detected the first gravitational-wave signal and since then tens of such events have been spotted. The observation and pinpointing of such gravitational waves is expected to be boosted in the coming years by the recent completion of Japan’s KAGRA observatory, which is the world’s first underground gravitational-wave observatory to use cryogenic mirrors.

https://physicsworld.com/a/european-physicists-propose-huge-underground-gravitational-wave-laboratory/

https://physicsworld.com/a/physicists-in-china-unveil-plans-for-underground-gravitational-wave-observatory/
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Message 2019661 - Posted: 19 Nov 2019, 19:28:02 UTC

There is already a European project for an underground laser interferometer, Einstein. But Elgar would use atomic beams, that is matter instead of light.
Tullio
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Message 2019963 - Posted: 21 Nov 2019, 20:31:27 UTC

https://www.cnn.com/2019/11/21/world/three-black-holes-galaxy-scn/index.html

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Message 2020936 - Posted: 28 Nov 2019, 17:02:47 UTC - in response to Message 2019963.  

Scientists Just Found an "Impossible" Black Hole in The Milky Way Galaxy
https://www.sciencealert.com/an-impossible-black-hole-has-been-found-in-the-milky-way-galaxy

A new black hole search method has just yielded fruit, and boy is it juicy. Astronomers have found a stellar-mass black hole clocking in at around 70 times the mass of the Sun - but according to current models of stellar evolution, its size is impossible, at least in the Milky Way.

The chemical composition of our galaxy's most massive stars suggests that they lose most of their mass at the end of their lives through explosions and powerful stellar winds, before the star's core collapses into a black hole.

The hefty stars in the mass range that could produce a black hole are expected to end their lives in what is called a pair-instability supernova that completely obliterates the stellar core. So astronomers are scratching their heads trying to figure out how the black hole - named LB-1 - got so chonky.
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Message 2030341 - Posted: 1 Feb 2020, 17:36:26 UTC

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Message 2032001 - Posted: 12 Feb 2020, 0:03:23 UTC

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Message 2032002 - Posted: 12 Feb 2020, 0:04:55 UTC

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Message 2047426 - Posted: 28 Apr 2020, 17:02:16 UTC

https://www.cnn.com/2020/04/28/world/star-black-hole-chandra-scn/index.html

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Message 2048397 - Posted: 7 May 2020, 11:11:03 UTC

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Message 2048930 - Posted: 12 May 2020, 10:53:58 UTC

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Message 2051665 - Posted: 12 Jun 2020, 14:05:42 UTC

https://www.cnn.com/2020/06/12/world/black-hole-beating-heart-scn/index.html

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Message 2053880 - Posted: 23 Jul 2020, 6:24:34 UTC - in response to Message 1971970.  
Last modified: 23 Jul 2020, 6:25:02 UTC

There is an image taken by a network of radiotelescopes. You cannot see the black hole, only its events horizon and matter falling into it.
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Message 2056312 - Posted: 2 Sep 2020, 15:31:54 UTC - in response to Message 1991664.  

Virgo and one of the LIGO detectors have seen for the first time a black hole-neutron star merging. The other LIGO detector was temporarily out of commission. The event must still be confirmed by data analysis.
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Message 2056380 - Posted: 3 Sep 2020, 10:58:26 UTC

LIGO and Virgo have stopped activities due to Covid19. But German GEO600 in Hannover and KAGRA in Japan have cooperated.
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Message 2058443 - Posted: 6 Oct 2020, 10:32:00 UTC
Last modified: 6 Oct 2020, 10:32:40 UTC

Nobel Prize in Physics. Half to Roger Penrose, UK, for his 1979 paper with Stephen Hawking which demonstrated that black holes are a logical consequence of General Relativity, The other half to Reinhard Genzel, Germany, and Andrea Ghez, USA, for demonstrating the existence of a massive black hole at the center of our Galaxy. Congratulations to Roger Penrose. I have a hard copy letter from him, partly handwritten.
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Message 2058461 - Posted: 6 Oct 2020, 14:30:09 UTC

Errata corrige: the Hawking-Penrose seminal paper on black holes was published in 1970, not 1979. I checked this on "A brief history of time" by Stephen Hawking.
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Message 2058475 - Posted: 6 Oct 2020, 18:23:58 UTC - in response to Message 2058443.  
Last modified: 6 Oct 2020, 18:26:35 UTC

Nobel Prize in Physics. Half to Roger Penrose, UK, for his 19791970 paper with Stephen Hawking which demonstrated that black holes are a logical consequence of General Relativity, The other half to Reinhard Genzel, Germany, and Andrea Ghez, USA, for demonstrating the existence of a massive black hole at the center of our Galaxy. Congratulations to Roger Penrose. I have a hard copy letter from him, partly handwritten.

Tullio,

Thanks for those. And hey! What book were you working on with/for him?


As an aside, I never realized that it was Roger Penrose that gave inspiration to some of the lithographs made by MC Escher!

There's good write-ups on:

Black hole breakthroughs win Nobel physics prize

Sir Roger Penrose: The man who proved black holes weren't 'impossible'



Keep searchin',
Martin
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Message boards : Science (non-SETI) : Black Holes part 4


 
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