We don't have a working theory that unifies gravity with quantum mechanics.
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Science & Space
Gravity describes the large scale universe well, and quantum mechanics describes the tiny scale well, but the two don't fit together mathematically. A unified theory would finally explain what happens inside black holes and at the birth of the universe.
Team Humans Club. (2026). Problem WS00002: We don't have a working theory that unifies gravity with quantum mechanics.. World Solve. Retrieved 20 Jul 2026, from https://worldsolve.org/index.php?id=2