Black Hole Collision: What Happens When a Large Swallows Smaller?

In summary, when a larger black hole eats a smaller one, their event horizons merge and the resulting black hole settles down. At no point does anything inside an event horizon get sucked outside of it. However, the act of merging can cause chaos in material outside the horizons and result in gravitational waves. These waves, predicted by general relativity and confirmed by the LIGO experiment, are not related to material outside the black holes. Black holes also accelerate material near them, creating an accretion disc that emits in the x-ray spectrum, but this is unrelated to gravitational waves.
  • #1
James Minwell
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Its thought that nothing can escape a black hole (correct me if I'm wrong) but what happens when a larger black hole eats a smaller one? Could there be a instance in time where matter was torn out of the smaller black hole, past its event horizon and into the bigger one? Thanks!
 
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  • #2
No, what happens is that the event horizons merge first, and then quickly things settle down to become one bigger black hole.
At no point does anything inside an event horizon get sucked outside of it.
A simulation here:

However the act of merging causes chaos in material which already is outside the horizons, and one result of this is gravity waves.
Gravity waves were predicted by general relativity and were confirmed as detected by the LIGO experiment earlier this year
 
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  • #3
interesting! Thanks!
 
  • #4
rootone said:
However the act of merging causes chaos in material which already is outside the horizons, and one result of this is gravity waves.
Gravitational waves (not gravity waves - those are a kind of surface wave in liquids) aren't related to material outside the holes. They would occur even for two otherwise completely isolated black holes. Edit: at least, in general relativity.

Black holes do accelerate material near them so that it is hot enough to emit in the x-ray spectrum. This is called an accretion disc, and is one of the ways we can hope to see a hole (otherwise it's a black hole on a black background). But it is unrelated to gravitational waves.
 
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FAQ: Black Hole Collision: What Happens When a Large Swallows Smaller?

1. What exactly is a black hole collision?

A black hole collision occurs when two black holes, which are extremely dense objects with gravitational pull so strong that even light cannot escape, merge together due to their orbiting paths crossing.

2. How are black hole collisions detected?

Scientists detect black hole collisions through the detection of gravitational waves, which are ripples in space-time caused by the massive objects moving and merging. These waves can be detected by specialized instruments such as the LIGO (Laser Interferometer Gravitational-Wave Observatory).

3. What happens to the black holes during a collision?

As the two black holes merge, they form a larger, more massive black hole. The energy released during the collision creates intense gravitational waves, causing the newly formed black hole to vibrate and emit gravitational waves.

4. Can anything survive a black hole collision?

No, nothing can survive a black hole collision. The intense gravitational forces would tear apart any matter, including stars and planets, before they even reach the event horizon of the black hole.

5. What can we learn from black hole collisions?

Black hole collisions provide valuable insights into the laws of gravity and the nature of space-time. They also give scientists the opportunity to test and refine Einstein's theory of general relativity.

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