The metric expansion of space is the averaged increase of metric (i.e. measured) distance between distant objects in the universe with time.
It is an intrinsic expansion—that is, it is defined by the relative separation of parts of the universe and not by motion "outward" into preexisting space. (In other words, the universe is not expanding "into" anything outside of itself).
Metric expansion is a key feature of Big Bang cosmology and is modeled...
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Metric expansion of space
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