The largest asteroid is Ceres, which is about a quarter the size of the moon.
最大的小行星是谷神星，其体积大约是月球的四分之一。
It will probably be easier to do this on the moon than on an asteroid.
显然，在月球上完成这个任务比在小行星上完成要容易。
Potential destinations include an asteroid, the moon and eventually Mars.
现在以确定的潜在目的地有小行星，月球，当然最终自然是火星。
This one is the asteroid ida. note its little moon satellite, dactyl , at the right.
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.
这是小行星依达，右方的小白点为其卫星达克图。
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