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Who says there was nothing at any point in the history of the universe?
"In its standard form, the big bang theory assumes that all parts of the universe began expanding simultaneously. But how could all the different parts of the universe synchronize the beginning of their expansion? Who gave the command?"
Andrei Linde, "The Self-Reproducing Inflationary Universe", Scientific American, vol. 271, 1994, p. 48
On the other note, how can a universe be contained in a single minuscule point of finite size only to explode with such a force that it spans to a size so grand that we still can not fathom the sheer magnitude? What happened to the gravitational constant that kept everything there? It simply didn't disappear. When a sun dies, it still contains a gravitational constant, in some cases creates an exponentially larger gravitational pull we know as a black hole. If this is the case, then why didn't that massive explosion simply cause a galactic sized gravitational singularity that prevented the entire universe from forming at all? The Big Bang seems to be a complete contradiction to how the universe works to this day. But that's just from what I read based on similar explosions of related galactic scale.