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PBS Space Time
Something Disturbing Happens When You Solve Einstein's Equations This Way
Season 11
Episode 25
Gödel discovered a solution to General Relativity that actually permits time travel — no exotic physics required. His "Gödel universe" reveals that spacetime itself can loop back on itself under certain conditions, blurring the line between past and future. This exposes a startling limitation: the theory offers no guarantee of a consistent cause and effect.
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