What is the conceptual model for the universe's origin that flows naturally from extrapolating Hubble's observations backward in time?

Answer

The Big Bang

Extrapolating the observed expansion of space backward leads directly to models describing the universe originating from an extremely dense, hot state, which is the basis of the Big Bang concept.

What is the conceptual model for the universe's origin that flows naturally from extrapolating Hubble's observations backward in time?
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