What happens if two black holes collide

In summary, the conversation discusses the observation of two black holes colliding and whether they merge to form one or remain separate objects. It also touches on the concept of black holes having infinite mass and whether this means they have infinite gravity. The summary also mentions Stephen Hawking's work on the event horizon of black holes and how the gravity outside a black hole is no different from the star it formed from. It is also noted that the gravity becomes stronger near a black hole, making it difficult for even light to escape.
  • #1
Dalton Peters
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I was reading up on the observation that occurred October of this year and started wondering what happens when two black holes collide do they merge to make one or do they collide as two separate objects kind of like two basketballs touching each other and also sort of a side question I've heard some people say that black holes have almost infinite mass does this mean that they might have almost infinite gravity as well (please excuse any ignorance that may be evident in this post)
 
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  • #2
Dalton Peters said:
I was reading up on the observation that occurred October of this year and started wondering what happens when two black holes collide do they merge to make one or do they collide as two separate objects kind of like two basketballs touching each other and also sort of a side question I've heard some people say that black holes have almost infinite mass does this mean that they might have almost infinite gravity as well (please excuse any ignorance that may be evident in this post)

@Dalton Peters , What happens when two black holes collide is better explain by Stephen Hawking's excellent work about the Event Horizon of black holes. Hawking discovered that when two black holes collide, they'll merge, and the new black hole formed will have the area of the even horizon (area after which nothing can flee from the black hole) bigger or the same size of the areas of the event horizon of the two black holes added together. The "infinite gravity" you refers to, comes from the fact that a black hole is formed when the density of an object gets so bigger that the curvature of space-time it creates is bigger in gravitational attraction than even light has speed to escape from. And considering light is the fastest thing in the universe, if light doesn't escape a black hole (after it passes by its event horizon), nothing escapes. I hope that might help.
 
  • #3
Lukeblackhill said:
@Dalton Peters , What happens when two black holes collide is better explain by Stephen Hawking's excellent work about the Event Horizon of black holes. Hawking discovered that when two black holes collide, they'll merge, and the new black hole formed will have the area of the even horizon (area after which nothing can flee from the black hole) bigger or the same size of the areas of the event horizon of the two black holes added together. The "infinite gravity" you refers to, comes from the fact that a black hole is formed when the density of an object gets so bigger that the curvature of space-time it creates is bigger in gravitational attraction than even light has speed to escape from. And considering light is the fastest thing in the universe, if light doesn't escape a black hole (after it passes by its event horizon), nothing escapes. I hope that might help.
How does one calculate the event horizon
 
  • #4
Dalton Peters said:
I was reading up on the observation that occurred October of this year and started wondering what happens when two black holes collide do they merge to make one or do they collide as two separate objects kind of like two basketballs touching each other and also sort of a side question I've heard some people say that black holes have almost infinite mass does this mean that they might have almost infinite gravity as well (please excuse any ignorance that may be evident in this post)

The people who say that a black hole has infinite mass are wrong. They have a finite mass and are formed when a very large star collapses in on itself. The gravity outside a black hole is, in fact, no different from the star from which they formed. The Sun is too small to become a black hole, but if hypothetically it did collapse into a black hole, then the orbit of the Earth would be unaffected.

But, as the black hole is much smaller than the star that formed it, you can get much closer to a black hole. So close that the gravity becomes so strong that even light cannot escape. In particular, the light from the collapsing star cannot escape.

There are several video simulations on line of two black holes colliding and merging.
 
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  • #5
PeroK said:
The people who say that a black hole has infinite mass are wrong. They have a finite mass and are formed when a very large star collapses in on itself. The gravity outside a black hole is, in fact, no different from the star from which they formed. The Sun is too small to become a black hole, but if hypothetically it did collapse into a black hole, then the orbit of the Earth would be unaffected.

But, as the black hole is much smaller than the star that formed it, you can get much closer to a black hole. So close that the gravity becomes so strong that even light cannot escape. In particular, the light from the collapsing star cannot escape.

There are several video simulations on line of two black holes colliding and merging.
I have a sort of a side question as well since things can get much closer is there any black holes that have the gravity to rip apart an atom
 
  • #6
Dalton Peters said:
I have a sort of a side question as well since things can get much closer is there any black holes that have the gravity to rip apart an atom

As far as I understand, yes. If you think about it this way, an atomic bomb works by splitting atomic nuclei. The amount of energy there is nothing compared to the gravitational force of a black hole. Also, mass does not become infinite at singularity, gravity does. The reason that light cannot escape is that the black hole pulls space-time toward it's singularity faster than light can travel.
 
  • #7
Dalton Peters said:
How does one calculate the event horizon

It envolves the theory of General Relativity (what means a good deal of differential geometry) and concepts of topology, mainly those introduced by Sir Roger Penrose in the beginning of the 60's. I have a notion of it, but the calculations are quite complicated, more than my current level of understanding.
 
  • #9
I have one more side question photons are the fastest known thing right and they can't escape the event horizon is there anything out there that has more momentum than a photon and can escape the event horizon in theory?
 
  • #10
Dalton Peters said:
I have one more side question photons are the fastest known thing right and they can't escape the event horizon is there anything out there that has more momentum than a photon and can escape the event horizon in theory?

No, gravity is pulling spacetime to it's singularity faster than light can travel. Kind of the same way that the universe can expand faster than light. It's spacetime that is stretching.
 
  • #11
Dalton Peters said:
I have one more side question photons are the fastest known thing right and they can't escape the event horizon is there anything out there that has more momentum than a photon and can escape the event horizon in theory?

@Dalton Peters, there's a theory which ascribes the existence of particles called Takions, which in theory has a mirror-sort of symmetry with the Lorent'z invariance. That means that Takions move faster than the speed of light and suffer the same effects einstein's predicted for normal particles, when it decreases its speed to move closer and closer to the speed of light. But that is merely a theory, and has nothing experimental in it, yet.
 
  • #12
Lukeblackhill said:
@Dalton Peters, there's a theory which ascribes the existence of particles called Takions, which in theory has a mirror-sort of symmetry with the Lorent'z invariance. That means that Takions move faster than the speed of light and suffer the same effects einstein's predicted for normal particles, when it decreases its speed to move closer and closer to the speed of light. But that is merely a theory, and has nothing experimental in it, yet.

They are spelled Tachyons not "Takions" (even though it sounds the same phonetically - which is interesting and a bit unusual, usually on forums like this you get people with book knowledge who know how to spell words but not how to pronounce them, rather than visa versa).
 
  • #13
ohwilleke said:
They are spelled Tachyons not "Takions" (even though it sounds the same phonetically - which is interesting and a bit unusual, usually on forums like this you get people with book knowledge who know how to spell words but not how to pronounce them, rather than visa versa).

@ohwilleke, it's not a mistake of spelling. In fact, I read about it in an article written by a Brazilian physicist, and that seems the way they write. I haven't read it in english, so I did not know how to write it.
 

What happens if two black holes collide?

When two black holes collide, a phenomenon known as a merger occurs. This results in the formation of a larger, more massive black hole.

Will the collision create a bigger black hole?

Yes, the two black holes will combine and form a single black hole with a mass equal to the sum of the masses of the original two black holes.

What happens to the matter inside the black holes during the collision?

The matter inside the black holes is compressed and heated to extremely high temperatures, causing it to emit intense radiation. This radiation can be detected by telescopes and other instruments.

Can the collision of two black holes be detected?

Yes, the gravitational waves produced by the collision can be detected by specialized instruments such as the Laser Interferometer Gravitational-Wave Observatory (LIGO). These waves provide valuable information about the properties of the black holes involved.

Is there a limit to the size of black holes that can collide?

Technically, there is no limit to the size of black holes that can collide. However, the likelihood of a collision decreases as the size of the black holes increases, as there are fewer large black holes in the universe compared to smaller ones.

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