Quote:
Originally Posted by llatpog
...at what point of mass would it take to cause an expansion like that?
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The Big Bang is not an explosion. The term was invented to be dismissive but but caught on anyway.
We do not know why or how it happened. According to the Standard Model, we will never know what happened before the first 10^43 sec as the size was so small and the stuff so hot and dense, the known laws of physics due not apply.
Certainly we cannot know that happened before. For more, check the Timeline of the Big Bang at Wikipedia.