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Ep 63: "The Fabric of Reality" episode 1

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The Importance of General Relativity

General relativity allows us to predict the motion of planets. Can we make a reliable prediction for what those planets are going to be doing a billion years from now? No, for a whole bunch of reasons. We cannot assume that some other large cosmological body isn't going to cause a collision with an object within our solar system. Our ignorance about what else might happen to the solar system into the distant future. A comet could come, a stray neutron star could go wandering through the solar system. Who knows? But more, the more optimistic view is, as we learn from the beginning of infinity, we don't know what human civilization is going to be like, abillion years from now

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