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PostPosted: Wed Apr 10, 2019 4:46 pm 
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It's black.

Looks just like the math predicted.

The halo is the accretion disk. It looks lopsided to us because of General Relativity. The middle is the black hole. You can't see it. RF can't see it. Nothing can see it. Photons check in, but they don't check out.

The middle is not really that big, again General Relativity. It is, however, one summbitch black hole. If you were in the accretion disk, you would be a glowing string of molecules.

https://www.bbc.com/news/science-environment-47873592

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PostPosted: Wed Apr 10, 2019 5:35 pm 
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I was going to respond to you that posting porn pictures are a violation of forum rules but then I realized this was about astronomy. :rw)

Cool picture. It's a composite of photographs taken by eight satellite telescopes which together would create a lens about the size of the Earth.

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PostPosted: Thu Apr 11, 2019 2:29 pm 
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Yes, a synthetic aperture RF setup with a virtual size matching the earth. Any bigger and you'd have to put radio telescopes in space. The red is false color (you can't see RF) though even in visible light this black hole is so redshifted that the event horizon/ accretion disk/ whatever would look like that from here anyway, unless it was all in the IR.

The universe is a very strange place.

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PostPosted: Thu Apr 11, 2019 3:29 pm 
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Yes, a synthetic aperture RF setup with a virtual size matching the earth. Any bigger and you'd have to put radio telescopes in space. The red is false color (you can't see RF) though even in visible light this black hole is so redshifted that the event horizon/ accretion disk/ whatever would look like that from here anyway, unless it was all in the IR.

The universe is a very strange place.

Part of the problem is what you pointed out. I doubt there are many of us who could read and understand the digital data from a RF signal so have to be converted into a medium the average person can see. Colors are assigned to denote different signal strengths.

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PostPosted: Thu Apr 11, 2019 3:35 pm 
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It's black.

Looks just like the math predicted.

The halo is the accretion disk. It looks lopsided to us because of General Relativity. The middle is the black hole. You can't see it. RF can't see it. Nothing can see it. Photons check in, but they don't check out.

The middle is not really that big, again General Relativity. It is, however, one summbitch black hole. If you were in the accretion disk, you would be a glowing string of molecules.

https://www.bbc.com/news/science-environment-47873592

Image

Was posting that here yesterday and forgot to come back and finish.

Amazing stuff

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PostPosted: Thu Apr 11, 2019 7:53 pm 
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anyone know of where in the sky this is located? like, relative to saturn.

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PostPosted: Fri Apr 12, 2019 1:39 pm 
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I fucking hate cons


https://www.cnn.com/2019/04/12/us/andre ... index.html


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To undermine Katherine Bouman's role in the Black Hole photo, trolls held up a white man as the real hero -- until he fought back

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PostPosted: Fri Apr 12, 2019 2:45 pm 
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I can't remember its position. It's not the one at our galactic center. It's way bigger than that. I believe it's the biggest black hole we've discovered. You can't see black holes, but fortunately they emit energy for various reasons from the stuff around them that hasn't fallen into the singularity yet.

The universe described in General Relativity is an extremely bizarre place, and the Schwarzschild Solution of same is even more bizarre. People keep trying to find theories that aren't as weird, but these keep proving out from observation. Pretty good for a couple of dead 20th century physicists.

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PostPosted: Fri Apr 12, 2019 3:49 pm 
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Neil checks in...


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PostPosted: Fri Apr 12, 2019 5:32 pm 
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The photo is of the supermassive black hole at the center of a nearby galaxy, M87; not the one many believe is at the center of our own galaxy, the Milky Way.

I guess I could fidget with one of my computer sky finder programs and tell you where M87 is in the sky relative to other stuff visible, but I'm not sure it's visible without a telescope. It's 55 million light years away.

EDIT: it's near the constellation we call Virgo, just googled the answer.
https://en.wikipedia.org/wiki/Messier_87

Messier 87 (also known as Virgo A or NGC 4486, generally abbreviated to M87) is a supergiant elliptical galaxy in the constellation Virgo. One of the most massive galaxies in the local Universe,[a] it has a large population of globular clusters—about 12,000 compared with the 150–200 orbiting the Milky Way—and a jet of energetic plasma that originates at the core and extends at least 1,500 parsecs (4,900 light-years), traveling at relativistic speed. It is one of the brightest radio sources in the sky and a popular target for both amateur and professional astronomers.

[snip][end]

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PostPosted: Sat Apr 13, 2019 3:50 pm 
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It's all mathematical now, but if observation keeps fitting the General Relativity R-sub-S thing, then there should be white holes where "information" that is not of this universe can leak through from black holes that would also have to be not of this universe. We've never discovered any, but perhaps said "information" is invisible to us.

Another physicist has gotten a following proposing an inflationary model, which predicts a near infinite, or perhaps infinite, number of universes co-existing on different vacuum levels. This allows possibilities like a Big Bang starting in your morning coffee, but you'd never see it.

Another issue is that we haven't discovered anywhere near enough mass to make this particular universe all work the way it seems to be working. Hence the theories on dark matter and such.

We don't know who's right. We know that we know damn little.

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PostPosted: Sat Apr 13, 2019 4:06 pm 
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Yeah, at the center of a black hole is a singularity. What's going on there? Any physicist will tell you this is where all the laws of physics basically start going to infinity and stop making sense. :D

You'd never find out - you'll be crushed and smashed by gravitational forces long before getting there, you can't just eject and ride it out like the guy did in Interstellar. :mrgreen:

But, in theory, if something could survive, yes, it's possible "on the other side" you would emerge either elsewhere in the universe through a "white hole" (a wormhole), or even into another universe. We just don't know.

Black holes were speculative objects, until we found an actual one (in Cygnus X-1), and finally photographed one now. And now we realize there may be a supermassive one at the center of every galaxy, including our own.

It might be good our solar system is out on the edge of a spiral arm, it seems to be swallowing all the stuff close by.

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PostPosted: Mon Apr 15, 2019 1:20 pm 
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Yes, the singularity is a place where General Relativity blows up, everything goes to infinity, and spacetime essentially stops existing. People are always surviving black holes in movies, but that's movie magic. You'd be a long skinny string of glowing ionized molecules by the time you got to the event horizon.

There's some dispute whether some "information" could leak out via quantum tunneling, assuming that still exists in the singularity.

They're using the same process to image the black hole at our galactic center, which of course is way smaller than the middle of M87. Indeed, the center of this galaxy looks like a fairly dangerous place, and then of course the whole thing is going to collide with Andromeda, though with enough empty space for stuff to pass in the night.

Notre Dame cathedral in Paris is fully involved in flames. Serious. I guess our tour is cancelled.

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