事实上，它是一个双星系统，从地球这边看，就是一颗星公转到另一颗星的前面。
In fact, this is a multiple star system, where one star regularly passes in front of another as seen from our earthly perspective.
既然冥王星已能重新扳回太阳系以外宇宙中的老大地位，那么天文学家应不应该把另一个名号——一颗毫无问题的行星，也还给它呢？
Now that Pluto may have regained its status as the largest object in the outer solar system, should astronomers consider giving it back another former title - that of full-fledged planet?
发现这颗行星同样一组天文学家早些时候也发现另一颗行星，该行星同海王星类似，是一颗巨大的气体行星，围绕恒星运转的周期为5.4天。
The same team of astronomers who discovered it had earlier found another planet, this time a gaseous giant similar to Neptune, orbiting the same star every 5.4 days.
后来，赫歇尔发现了另一颗土星的卫星，以及天王星的两颗卫星。
He would go on to discover another of Saturnian satellite as well as two of Uranus's moons.
南鱼座α星的东面是另一个巨大的暗星座—鲸鱼座，它仅仅有一颗明亮的恒星，鲸鱼座β星，象征着鲸鱼的尾巴。
To the east of Fomalhaut is another huge dim constellation, Cetus the Whale, with the only other brightish star in the area, Deneb Kaitos, which means the tail of the whale.
月球与木星的卫星有一个共同的特征，每一颗卫星都只有一面面向环卫母星，另一面背离。
Our moon and Jupiter's moons share a common characteristic. Each moon has one side that faces toward its parent planet, while the other side faces away.
月球与木星的卫星有一个共同的特征，每一颗卫星都只有一面面向环卫母星，另一面背离。
Our moon and Jupiter's moons share a common characteristic. Each moon has one side that faces toward its parent planet, while the other side faces away.
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