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Technically the state of the current universe is still the Big Bang in progress, sort of. If the Big Bang was a huge explosion that hurled everything outward, then the universe expanding is a direct result from that. Until gravity starts to overtake the explosive force, at which point it will shrink again until we are all crunched to death and the entire process begins again.
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You haven't understood expansion. Gravity will never overtake the explosive force, because the universe's expansion is accelerating. Due to Dark Energy (translation: "We don't really know why, yet. But we're working on it."), the universe is spreading itself out faster and faster.