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cosmic time

(time since the Big Bang)

Cosmic time is the time since the Big Bang. In contrast, lookback time is time from the present, going backward.

Current and recent cosmic time values depend upon the Hubble constant, which is subject to future correction and refinement. In scientific study, cosmic time is of most useful in describing theories of the early universe, such as events that would happen after specific time intervals following the Big Bang.

(time,cosmology,measure,Big Bang)

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