Noun
(astrophysics) A theoretically possible, but physically highly unlikely, singularity from which matter and energy are able to escape but unable to enter; the antithesis of a black hole.
Used other than figuratively or idiomatically: see white, hole.
Source: en.wiktionary.orgSakharov called such singularities a collapse and an anticollapse, which are an alternative to the couple black hole and white hole in the wormhole theory. Source: Internet
While a black hole sucks everything in, including light, a white hole releases matter and light. Source: Internet