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westward comments on Crazy Ideas Thread - Less Wrong
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One thing I've never seen people mention re: time travel is that if you travel back in time six months, say, you'll find yourself floating out in space with the Earth on the other side of the Sun. (The Sun is in a slow orbit around the Milky Way, which itself is moving, right?) So practical time travel also requires practical space travel?
Slow orbit? More like 120 miles per second in reference to the galactic center.
Charlie Stross's Eschaton books have a pretty good take on time travelling, light cones, and causality.