Milky Way's satellite galaxies 银河系的卫星星系
In 1987 a star in one of the Milky Way's satellite galaxies exploded.
1987年,银河系内卫星星系的一颗恒星爆炸了。
On February 23, 1987, astronomers got the next best thing: a supernova in one of the Milky Way's satellite galaxies, the Large Magellanic Cloud.
在1987年2月23日,天文学家获得了次佳的机会:银河系的卫星星系“大麦哲伦云”中,发生了一次超新星爆发。
Astronomers once assumed they had always orbited the Milky way at approximately their current distances, like the other, lesser satellite galaxies in the Milky way's gravitational thrall.
天文学家曾经假设它们总是像其它银河系引力束缚下更小的卫星星系的星云一样,在它们目前近似地距离上围绕银河系的轨道运行。
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