Blackhole - For SteemSTEM Public-Domain Image RepositorysteemCreated with Sketch.

in #stem-art4 years ago (edited)



The above image, generated by @medro-martin is available for unrestricted use under a CC by 4.0 License.


This is an artists's rendition of a black hole.

A black hole is a region of spacetime exhibiting such strong gravitational effects that nothing—not even particles and electromagnetic radiation such as light—can escape from inside it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole. The boundary of the region from which no escape is possible is called the event horizon.

References (for the description)


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Nice to see some images related to physics! I am not sure for this one. I will try to be constructive and give you a physicist comment. Please don't be offended.

The first thing I asked myself was about this thing around the blackhole? From my perspective, it looks like someone is trying to put this poor black hole into a condom. I am really sorry to say it that way, but this is the best way I found to describe how I see it :D

If this is the accretion disk, maybe making it more spiral could help. Can you try? You may also want to add some radiation jet originating from the black hole, to make it potentially more realistic?

I can definitely add more things, but I am basically confused what exactly a black hole should look like??

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The last one is my bet, since it has the spiraling debris and jets, However, @lemouth, the interstellar version that @medro-martin was going for was potentially the most realistic looking according to the nobel prize winner and advisor of that movie Kip Thorne who then went on to write a book about the physics of the movie... so maybe they do look like Condoms?

The new image is actually much better (my comment was referring to the previous version), and I like it. If the motion could be made a little bit more spirally, it would even be better but this is at the level of the unnecessary details :)

The last one is the one I had in mind.

Please see my answer to mobbs :)

Okay my dear scientist fellows : @mobbs, @lemouth!!
What @mobbs says was exactly the reason why I went for the Interstellar type black hole, though the general perception still remains of the last type.
So, maybe I should just try making it a bit more spirally whenever I get time as @lemouth has suggested, and leave the jets since I am also running short of space for proper jets in my drawing. That's because I had planned for a more compact looking black hole initially.

Thanks a lot for your valuable suggestions.
Let me know if there is anything else...

Jets are there, arising from the dynamics around the black hole. We however don't know how they are exactly produced (we have instead different hypotheses). But this is not mandatory to have both on the same picture. The spiraling accretion is the most important effect.

That's good. So, maybe I'll make one more drawing with jets!
Since, we have had such a good and productive discussion, it must be put to use.
Will that be good?

I was not planning to write about black holes. What about trying to draw something on cosmic neutrinos and the Ptolemy project? I may write on this sooner or later :)

Okay, I'll definitely try it.
You can DM me the details(if any)...that will help me a lot.
But, you'll have to wait for approximately a week. I am currently finding it difficult to find time to post anything here...a bit busy currently..

Thanks :)

I was so busy... Don't worry, I will DM you the details later. This post won't appear before a week or two :D

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We can only see a black hole by what is around it and how they move. They are interesting to study.

This is not really correct. We can also 'see' (some) black holes through gravitational waves. The gravitational wave observatories were by the way the first ones to directly observe a black hole.

LIGO right?
I guess there are a few others as well...

Ligo and Virgo indeed :)

Good point
I did not know that they knew what the waves were from that they detected.
This is not my field but more of an interest.

It is slightly more subtle. The only phenomenon we know that is capable to produce such waves is the merging of two blackholes. Roughly speaking, this is more or less the same, but in fact, that could be something else that acts as a blackhole (a kind of "smell like a blackhole, live like a blackhole and eat like a blockhole" object). From our human perspective, therefore, this would simply be a blackhole. I don't know if I made this little difference clear enough. Please let me know. (and please apologies for the delay; I was so busy in offline life ;) ).

Its never to late :)

We picked up some waves from two colliding neutron stars that .
That caused some rethinking.
I don’t know that much about and more like a novice

The nice feature with the neutron star event is that it was followed by something visible with gamma rays. We thus had several ways to get information on the same catastrophic cosmic event: the three gravitational wave observatories plus many telescopes.

I only heard bits and pieces and that they thought it was black holes colliding.
I am starting to think that Neutron stars and their many types are worse, more destructive the black holes

They actually saw both: a bunch of black hole events and a single neutron star events.

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