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12 years ago
Briefly explain why an expanding universe implies a beginning (called a Big Bang). 
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12 years ago
The fact that the universe is expanding means the average distance between galaxies is growing, which implies that this average distance was smaller in the past. Extrapolating back in time, there must have been a time when the distance between galaxies (or their precursors) was zero, which must be the beginning of the universe.
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