and one more thing...
There's also something that is called a whitehole:
A white hole is the opposite of the blackhole; it repels stuff. we can also call it a "big bang". It is impossible to determine whether a universe existed before ours (before the bigbang) because Einstein though that just like in any natural physical/chemical/biologie cycle, theres a ddeath and a rebirth.
My theory is that when 2 or several blackholes come together (right now,,, over me---beatles)...sorry about that...
My theory is that when 2 or several black holes come together, there's a distortion powerful enough to... i guess create something new? which would also change einstein's theory that no matter can be made or destroyed.
My other theory is that when 2 black holes come together, the energy transmitten between them is strong enough to expulse their own matter from eachother (see concept of magnet and coil guns)
well... It was probably very hard to understand because I just spat out everything inside my brain in my words but yeah, I hope you learned something new :)