第一推动丛书·宇宙系列：霍金讲演录（新版）
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目送飞鸿2020-10-14It seems that the motion of the planets around the sun is ultimately chaotic, though with a long time scale. This means that the errors in any prediction get bigger as time goes on. After a certain time, it becomes impossible to predict the motion in detail. We can be fairly sure that the earth will not have a close encounter with Venus for quite a long time, but we cannot be certain that small perturbations in the orbits could not add up to cause such an encounter a billion years from now.