2 black holes question

[darude11]

Lets assume first that this is pure theoreticaly thread, because I believe that Steve Hawkings isn't registred on this forum. Thanks

What would happen if there would come too close (to their gravitational forces) two black holes? (With both totaly identical gravit. forces, yes, the probability of this happening is very low, but whatev')

 

[IfloatTHRUlife]

They would just envelop each other. They absorb matter, regardless of what it is, a black hole is just a ridiculously dense jumble of matter.

Kind of interesting to imagine though, maybe some cataclysmic event would happen as the two black holes met each others event horizons. Then again maybe nothing would happen at all aside from them absorbing each other. The matter in both black holes would already be broken down and compacted, so there wouldnt necessarily be any "event" aside from the absorption.

*Shrug*

 

[Melllvar]

What would happen if there would come too close (to their gravitational forces) two black holes? (With both totaly identical gravit. forces, yes, the probability of this happening is very low, but whatev')

Define 'too close (to their gravitational forces)'. At some point their event horizons should overlap, making them effectively into one black hole with two singularities (I think). If that doesn't happen then they develop some kind of stable orbit or pass each other on a hyperbolic trajectory. Beyond that there should be gravitational waves from the interaction.

I did find this article about the possibility of one of the black holes being ejected from the system at high speed: http://www.universetoday.com/13002/what-happens-when-supermassive-black-holes-collide/

 

[Cogwulf]

Well simulations predict massive gravitational waves being generated, which are only hypothetical anyway.

http://news.cnet.com/Supercomputer-simulates-black-hole-collision/2100-11397_3-6062605.html

I have read before that a collision would generate large amounts of x-ray radiation as well.


The probability of it occuring is actually quite high. Galaxies are colliding all the time, and it is inevitable that the supermassive black holes at the centres of colliding galaxies will also collide eventually.

 

[menaceh2k]

It is believed that all galaxies have have supermassive black holes at there centers. Galaxies often often collide with each other. When they do they usually partake in a dance and eventually merge into one galaxy. I assume they just merge into an even larger black hole and expel an even larger quasar. (quasars are the streams of energies that escape from a black hole)

 

[Vrecknidj]

Two black holes moving toward each other are a little like two drops of water moving toward each other. Eventually they get close enough to merge and make one hole (or drop).

 

[Reverse Transcriptase]

Yeah, so I think the interesting question here is: Would it emit radiation?

This TED talk is relevant for our background knowledge: http://www.ted.com/talks/andrea_ghez_the_hunt_for_a_supermassive_black_hole.html
And for bonus points, whenever she says "Supermassive black hole", say "supermassive black hole" the same way that Muse does.
http://www.youtube.com/watch?v=Xsp3_a-PMTw (Especially at 2:10.)

When star clusters are sucked into (supermassive) black holes a bunch of radiation is released. But, if a black hole was absorbed by another black hole-- then any mass that's about to pass through the event horizon would already be within an event horizon! So. You'd see a very interesting silhouette.

EDIT// and after re-watching this TED talk I pose a question:
She says that there is 4million Sols worth of mass in an area the size of our solar system. What is the Schwarzschild radius of something that is 4million Sols? Like, how much farther is she supposed to narrow it down? Would be an interesting ratio to have.

 

[420MuNkEy]

I could be thinking of something else, I remember hearing that in such a scenario (again, could be the wrong one) that they would become trapped in orbit around each other producing gravity waves.

 

[pjoa09]

huh. I thought they would just cancel out.

sucking the sucking

 

[caprice30]

There is no proof of the existance of gravitational waves! Or I would say, because gravitational aberation is canceld when calculating planets, galaxies gravitational interaction, prooves the opposite.

http://metaresearch.org/cosmology/speed_of_gravity.asp

http://journals.cambridge.org/downl...8Xa.pdf&code=12380741d4521ac39a01ec5fab104dcd

 

[darude11]

uuh... I was just interested in picture or something.. that how awesome would it look like?

 

[420MuNkEy]

uuh... I was just interested in picture or something.. that how awesome would it look like?

Since light can't escape a black hole, it wouldn't look like much.

 

[Dr. Freeman]

Gamma ray burst.

 

[ummidk]

I think the larger one would absorb the smaller one though, so in the case of completely equal gravity which would absorb which. Although for them to be completely identical the odds are so close to impossible because with enough decimals one is probably more eventually down the line.

 

[Jesse]

Dumb question is bumb

 

[Jordan~]

What's dumb about black holes colliding? That's awesome. Don't tell me that if you saw that in a movie you wouldn't think that was awesome.

Though of course it wouldn't really look like anything at all, would it? Hmm. That doesn't mean that I can't make the noises it would sound like if there was noise in space in my sleepless, euphoric state.

 

[Jesse]

What is awesome about it? A black hole is just a bunch of crap in a small amount of space. Another black hole "colliding" would just be it moving slowly (taking millions of years) to join it eventually making one roughly twice the size. Sorry I'm kind of in a poor mood

 

[Jordan~]

Everything that has ever happened has just been a bunch of crap in a small amount of space, relatively speaking.

Well, here's my argument:
Exceptionally large or heavy things bumping into eachother is cool.
Black holes are exceptionally heavy.
Black holes bumping into eachother is cool.

 

[Jesse]

Us discussing what would happen is infinitely more exciting than finding what actually happens as in no way could it affect us at all.

 

[Jordan~]

Neither could the events of any novel but that doesn't make them boring.

Besides, we wouldn't have a thing to discuss happening unless the thing could happen.

 

[Jesse]

The event would take longer than our lifetime to observe

 

[Picopico]

Inception.