only when there is one star, and small planets like those in the Solar system
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送交者: steven 于 2007-01-23, 21:44:52:
回答: 第二题摆个微分方程组一解就是椭圆了 由 HunHunSheng 于 2007-01-23, 18:21:56:
the Keplers laws hold. If there are twin stars, or the planets are very close, they won't follow Keplers 1st law. As for stars, I don't think we know what orbits the are in. Not ellipse for sure.
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