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What is the opposite of a black hole?

The opposite of a black hole would be a white hole. While a black hole is a region of space where the gravitational pull is so strong that nothing, not even light, can escape from it, a white hole is a hypothetical region of space where matter and energy can only leave and not enter.

While black holes are formed by the collapse of a massive star, white holes are not thought to be formed in the same way. Instead, they are predicted by some theoretical models of the universe as a possible consequence of the laws of physics. However, there is currently no observational evidence for the existence of white holes.
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