#6/ According to physicists, white holes are possible, although as of yet we have found none.

According to Erik Curiel writing for The Stanford Encyclopedia of Philosophy: "Because the field equations of general relativity do not pick out a preferred direction of time, if the formation of a black hole is allowed by the laws of spacetime and gravity, then those laws also permit white holes."

We have never, to our knowledge, actually observed a white hole. Physicists think they're not likely able to exist in the Universe, and there are several reasons for this.

One big question is, how would they form? We have plausible models for how black holes form, but it's not as if we can actually rewind time in the Universe to turn them into white holes.

You'd have to start with the singularity and go backwards, the object vomiting up matter until... pop! it assembles itself into a star. That would require a decrease in entropy, which would violate the second law of thermodynamics.

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