Each moon has one side that faces toward its parentplanet, while the other side faces away.
每个卫星都有一面面向它的主恒星,而另外一面远离其主恒星。
2
And conversely, Earth's gravity has slowed the moon's rotation so that it always presents the same face to its parentplanet.
反过来,地球的引力减慢了月球的自转速度,结果月球总是将其相同的一面展现给地球。
3
Our moon and Jupiter's moons share a common characteristic. Each moon has one side that faces toward its parentplanet, while the other side faces away.