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You can watch the entire Startalk episode here: https://www.youtube.com/watch?v=y8b93R3kfso

The Andromeda Paradox, originally from Roger Penrose, is a brain-melting thought experiment that brings up the question of whether the future is still open or already fixed in Einstein's theory of relativity As I recently noticed, it's even got multiple physicists' brains tied into knots at this point. Let's take a look.

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