If you take the present state of our universe and roll time backwards, it is generally accepted that eventually everything that is in our universe would be in the same place, at the point of origin of the big bang.

I think it is obvious that if everything in the universe was in the same place, you would have an extremely large black hole, and I submit that this must be what existed before the explosion.

There are several limits to phenomena that we are familiar with (even if we are not really sure why) such as the limit to how cold anything can be (absolute zero), and the limit to how fast anything can go (speed of light) for example. It is not a real stretch then to think there may be a limit to compressibility as well. Or to how hot anything can get (It must be pretty warm at the centre of a black hole.).

Perhaps when a black hole gets big enough (Ok, heavy enough or dense enough, they are not really very big) it reaches a limit of compression or temperature and becomes unstable for some reason. I am not a physicist, but several possible reasons have come to mind... one of the most promising being that perhaps at the centre of a really big black hole matter and antimatter become so close that they react and explode, causing a chain reaction resulting in a really big bang.

Another is that perhaps at the centre matter gets compressed to the point that it no longer exists or becomes something else altogether, leaving only energy (somewhat unbridled energy at this point) again resulting in a cascading explosion.

Consider also the possible results of two such massive black holes finding each other and colliding at near the speed of light, where the combined speed of each would very much exceed the speed of light at impact. It is not hard to imaging that strange things might happen.

Or none of the above. Whatever the actual cause, it appears evident that it happened, so the answer to the question of what existed before the big bang is "Everything".

I can see no reason not to think that there are probably many such massive black holes in existence, (perhaps an infinite number of them) one or several fairly close to our universe, pulling parts of it toward them, which would explain why some galaxies are speeding up.

Sceptical? What the hell else could cause galaxies to speed up?

Too simple? The simple answers are usually the right ones.

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