About white hole

In general theory of realtivity a white hole is a hypothetical region of space time and singularity  which can not be entered from outside although energy-matter light and information can escape from it. In this way
It is reverse of a black hole which can be entered only from the outside and from which energy matter and information 
can't escape. white hole appear in the theory of external black hole.
Physicstis describe a white hole as a black hole which is reversible of black hole. black hole event  horizon is a sphere of no return a white hole event horizon is a boundary of admission-space time most exclusive curve. But sadly no space craft and telescope do no reach white hole and it is in theory only but with advancement of technology we can find white hole like we find black hole. 

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