What happens when two black holes collide?

Answer 1

If two black holes collide, they will orbit each other for months-years (depending on mass), unable to escape each others gravitational pull. The bigger black hole of the two will eventually suck in the smaller one when it reaches its event horizon, ultimately forming an even bigger black hole.

Answer 2

In this case, (a) they will combine into a bigger black hole, and (b) due to the tremendous mass movements (accelerations, really) in the last phases of the merger, the black holes will send out intense gravitational waves.
When two black holes collide, they will form a single (larger) black hole. In the process of colliding, they should emit gravitational waves in large amounts.

Answer 3

The notion of a black hole "colliding" with a white hole is a purely hypothetical context for wormhole formation.

Note: The prevailing hypothesis is that there are no lone white holes. Rather a white hole, in general relativity, is a hypothetical region of SpaceTime which appear in the theory of eternal black holes. In addition to a black hole region in the future, such a solution of the Einstein field equations has a white hole region in its past. However, this region does not exist for black holes that have formed through gravitational collapse, nor are there any known physical processes through which a white hole could be formed.

Other Opinion: As a side note, other studies suggest that wormholes cannot be real because the very existence relies on the pairing of black holes or the pairing of a black hole and a white hole. And since there is no escape from a black hole (save the lost energy of matter being radiated), the paring black holes is an inept conception of travel. Similarly disputed is the co-existence of a black hole and a white hole; i.e. since there considered a set amount of energy and matter within the universe by virtue of the Big Bang, then there can be no loss or gain of energy or matter within an already created universe. Simply stated, the co-existence of a black hole and a white hole pairing imposes a SpaceTime paradox.

Answer 4

This may not be right but I think the two black holes would either explode due to the amount of gravity, or they will simply combine causing a bigger black hole. If theory 2 is correct and black holes keep combining , then there may be a really big black hole. If theory 1 is correct than there will be universal dismay. But dont take my word for it, it mat be wrong.

Answer 5

Since mass is conserved, if one black hole merged with another, a new larger black hole would form whose mass would be the sum of those of the two original black holes. In a simple example, since the Schwarzschild radius is proportional to mass, the new black hole from the combined mass of two identical black holes would have twice the radius.

Answer 6

In that case you'll get a larger black hole - one that has the combined mass of the original black holes (minus any mass that was radiated away as gravitational waves). This actually happens quite often, as a result of galaxy mergers. The supermassive black holes have a tendency to go towards the center of the galaxy, and in the case of a galaxy merger, the two black holes will eventually end up merging as well.Another thing that is expected to happen is that a lot of gravitational waves are emitted in this merger.

Answer 7

When two black holes collide, they will form a single (larger) black hole. In the process of colliding, they should emit gravitational waves in large amounts.

Answer 8

They would combine to make a larger black hole with a mass equal to the sum of their masses.

Answer 9

Then the mass of the swallower increases, and the swallowee disappears.