Ask Ethan: Do white holes, the opposite of black holes, physically exist?
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In our Universe, the mathematical forms that the laws of physics take on give us all of the possibilities for what’s allowed to conceivably exist. However, only by actually observing, measuring, and experimenting with our Universe itself can we determine which of the mathematical possibilities describes our physical reality. In Einstein’s general relativity, one of the very first theoretical solutions that was ever uncovered was the solution for a black hole: a region of space with so much matte
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