Q
What was before the Big Bang?
A
Expert Answer
According to standard cosmology, time itself began at the Big Bang, making 'before' meaningless. Some theories propose: a previous contracting universe (bounce cosmology), eternal inflation spawning our universe as a bubble, or quantum fluctuations in a pre-existing vacuum. None are confirmed.
Key Insight
According to standard cosmology, time itself began at the Big Bang, making 'before' meaningless.
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