小行星是较小的行星，它们中的大部分在火星和木星轨道间的小行星带中环绕太阳运行。

Asteroids are minor planets, most of which circle the sun in a region known as the asteroid belt, between the orbits of Mars and Jupiter.

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这意味着那些星球要与我们的家园有着近似的大小，并且在一条距离合适的轨道上环绕母星运行，而这个距离要使得水能够以液态的、能孕育生命的形式存在。

That meant they'd have to be about the same size as our home world, orbiting their parent star at about the right distance for water to exist in liquid, life-nurturing form.

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因为有卫星的头衔，而且沿椭圆形轨道环绕地球运行，月亮似乎每天平均51分钟返回到天空的同一地点。

Due to the moon's titled and elliptical orbit around Earth, the moon seems to return to the same place in the sky 51 minutes later each day, on average.

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