Question

what is white hole ?


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Answer 1

Answer:

In general relativity, a white hole is a hypothetical region of spacetime and singularity which cannot be entered from the outside, although energy-matter, light and information can escape from it. ... White holes appear in the theory of eternal black holes.

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Answer 2

A white hole is hypothetical region in space-time, into which nothing can be entered, but from it light and matter comes. but in black hole, nothing comes out except radiations, in it everything goes and no one (even the light) can't escape.