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第一个是一对质量与木星差不多的行星,这对行星步调一致地围绕距离地球15光年的母恒星旋转。
The first is a pair of planets, each about the mass of Jupiter, that whirl around their home star 15 light years from Earth in perfect lockstep.
特别地,取原点,让物体以一定的角速度,围绕原点旋转。
Instead of just somewhere,maybe I will have the origin,and I am trying to make it go around the origin in a circle at a certain angular velocity.
有时,天文学家们碰巧从侧面观察到系外行星的轨道,在这种情况下,行星在围绕恒星旋转的时候就会交替地呈现出有时光面较多、有时暗面较多。
Sometimes, they happen to see the orbits of exoplanets edge-on. In those cases, the planet alternately shows more of its dayside and then more of its nightside as it circles its star.
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