行星能有一个自身带有一个更小卫星的卫星吗？
这颗小行星是在一次例行检查中被一颗卫星发现的。
The asteroid was first spotted during a routine survey performed by a satellite.
地球和其他行星都是太阳的卫星。
而和土星同样是巨大气质行星的木星却有4颗大卫星。
But Saturn's fellow gas giant planet Jupiter has four big moons.
这颗行星也有五个卫星。
地球是太阳的一个行星，月亮是我们的卫星。
这个行星家庭以及它们的卫星，就是我们所知道的太阳系。
This family of planets, with their moons, is known as the solar system.
木星拥有十四个卫星，是所有行星中卫星最多的一个。
Jupiter has fourteen moons, the largest number of any planet.
这个行星有十个为人所知的卫星。
地球是太阳系的行星之一，月球是我们的卫星。
The earth is one of the sun's planets, and the moon is our satellite.
这是小行星依达，右方的小白点为其卫星达克图。
This one is the asteroid ida. note its little moon satellite, dactyl , at the right.
TITAN是所有行星的卫星中唯一有自己的大气层的卫星。
It is the only moon of any planet which has its own atmosphere.
这颗小行星是在一次卫星的例行检查中被首次发现的。
The asteroid was first spotted during a routine survey performed by a satellite.
这颗小行星是在一次卫星的例行检查中被首次发现的。
The asteroid was first spotted during a routine survey performed by a satellite.
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