# Question about Big Bang Theory

Why do we think that the Big Bang contained "all" the matter/energy in the universe? If we imagine the point, the "big bang point" to be some accumulation of mass, what makes us think that it should have "waited" for all the mass in the universe to accumulate in it before exploding?

That's just a thought that occurred to me.

DaveC426913
Gold Member
Why do we think that the Big Bang contained "all" the matter/energy in the universe? If we imagine the point, the "big bang point" to be some accumulation of mass, what makes us think that it should have "waited" for all the mass in the universe to accumulate in it before exploding?

That's just a thought that occurred to me.

When we reverse the film that is the expansion of the universe, we are able to see that all the matter in the universe came from one very localized place in space and time. We have been able to reverse this film back to one billionth of a second before the BB, and there are no discrepancies worth noting.

Why couldn't there be other such localized areas, billions upon billions of light years away from another bigbang. There could have been billions of bigbangs all over the universe. We just can't see far enough to gather the appropriate information, and we need to do more than just see as well. We have to go there, where ever there is. :P

DaveC426913
Gold Member
Why couldn't there be other such localized areas, billions upon billions of light years away from another bigbang. There could have been billions of bigbangs all over the universe. We just can't see far enough to gather the appropriate information, and we need to do more than just see as well. We have to go there, where ever there is. :P

1] We base our theories on what we observe. No observation, no theory.

2] A competing theory to what we have needs to explain everything our current theory does at least as well if not better. What does you supposition about matter elsewhere do?

We just can't see far enough to gather the appropriate information, and we need to do more than just see as well. We have to go there, where ever there is. :P
Why?