If the big bang occurred at time equals 0 then what was there before the big bang? And why was there something opposed to nothing that caused the big bang? How can there be something out of nothing?
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There's a theory that says matter was present widely spread with very low energy levels and no gravitational forces at all. Then an energy started pulling it together and after excess, big bang happend.
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Okay well its not that simple. Before the big bang this planet was just a gaseous nothing. So obviously un able to support life and then comes the big bang which was triggered by something changing in the atmosphere and that let a simple water algae start growing and then this is where controversy arises although it shouldnt, but boom there was life.
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Well something didn't come from nothing it came from a singularity of mass infiniantly dense and infinatly small. So when it exploded it created everything observable including time. People ask always where it happen like what star system or galaxy but in fact it happened everywhere and it is still happening everywhere that's why everything is moving away from eachother at the same speed so just says that its still effecting us. As for what was here befor our planet was here was there was nothing. Nothing as even space wasn't here this point didn't exisit or anyother part of space. And the big bang is happening billions of times a second if not more outside our universe creating new spaces with their own laws of physics where they might not even have gravity or time. Many other theories say that our universe is a big bounce meaning our universe has a life span then shrinks down and then bounces back creating a new big bang.
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In the beginning, the world was void and darkness was upon the face of the deep.
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Yes, Other universes were always there: M-theory.