Question

why universe is expending?​

Answer 1

Answer:

Expansion of the universe. The expansion of the universeis the increase of the distance between two distant parts of the universe with time. It is an intrinsic expansion whereby the scale of space itself changes. The universe does not expand "into" anything and does not require space to exist "outside" it.

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Answer 2

Answer:

the expansion of the universe is the increases of the distance between two distant parts of the universe with the time

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