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 Originally Posted by Keith
what would happen if two galaxies collided, would the super massive black holes collide at such high force combined with all the material circling them to also then get sucked in cause the big bang. or would the mass that is circling the original black holes help to influence the resulting spread of matter in the explosion
Galaxies are mostly empty space. The sun's nearest neighbor star is over 4 light years away. When galaxies collide, they largely pass right through each other, with a surprisingly small amount of mixing and stuff thrown away in all directions.
But that's not your question.
You want to know what happens when 2 super massive black holes collide. They spin around each other more and more quickly as they fall toward each other, like a twirling ice skater pulling in their arms. This does really crazy stuff to space-time, causing geodesic lines which are so relativistic that a particle can actually run into itself from behind, essentially existing on the entire orbit everywhere at once. Madness.
After that, the super massive black holes would merge into an even more super massive black hole. The combined gravity would likely "suck in" the nearest stars and nebulae in an accretion disk, and would have a long reaching effect as the "gravity ripples" spread through the surrounding galaxy.
No Big Bang, though, sorry. It's really quite a different beast than anything else.
Some cool NASA computer simulations of merging black holes
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