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The study of the universe as a four-dimensional fabric where space and time are woven together, meaning your past self is technically just far away in a direction you can't point. Spacetime sciences explain why time slows down near massive objects (gravity is weird), why you can't go back and fix your mistakes (causality is a harsh mistress), and why GPS satellites have to account for relativistic effects or you'd end up in the next county (Einstein saves you from wrong turns). It's physics for people who wanted to understand the universe and ended up even more confused.
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