White Hole

HYPOTHETICAL · the black hole in reverse

STATUS a valid solution, no evidence

Run a black hole backwards in time and the math still works: a white hole, which nothing can enter and which only spits matter and light out. They appear naturally in the equations, but no formation mechanism is known and none has ever been seen. Some speculative ideas link them to the end states of evaporating black holes. For now: a mirror image without a mirror.

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