圆盘产生自己的引力拖曳，这种相互作用的力夺走了行 星在其轨道上的动量，迫使它盘旋向恒星的方向。

The disk exerts its own gravitational tug, and this interplay of forces robs the planet of momentum in its orbital path, forcing it to spiral in toward the star.

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我回想起在晚上11点钟的时候，我正朝北方眺望北斗星，没有朝南面她家的方向看。

I think that at 11 p.m. I was looking north at the Big Dipper, not south toward her house.

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在灶神星轨道呆了一年之后的“黎明”号将在太空旅行中进行一次罕见的表演- - -它会重新点燃发动机并转变方向环绕另一个天体运行。

After spending a year in orbit around Vesta, Dawn will perform a trick rare in space travel-it will reignite its engines and head off to orbit another body.

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