Sciencephile the AI explains the Andromeda Paradox, a physics thought experiment that asks whether a single shared "now" can ...

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Imagine two people walking past each other on Earth yet they disagree about what’s happening right now in the Andromeda Galaxy. This is the Andromeda Paradox, one of the strangest implications of ...

(via Sabine Hossenfelder) 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 ...