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。
Sans wheels, which were needed for last year’s simulations to the surface of the moon, the vehicle could be transformed for asteroid exploration by mounting it on a flying platform, says NASA.
美宇航局说，这个太空探索车是去年月球表面太空模拟的必备工具。 这一工具可以改造一下，安装在一个飞行平台来适应小行星探索。
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。
Is there any relationship between the date of the EAS test and the passage of an asteroid passing between the Earth and Moon?
紧急报警系统测试的日期与小行星从地球和月亮之间穿过之间有什么关系么？
NASA will not return humans to the moon but might visit an asteroid-and much later Mars.
美国航空航天局放弃其人类重返月球的计划，取而代之的是探访一颗小行星和经过较长的一段时间后再探访火星的计划。
If that asteroid were to suddenly become as big as a moon, it would indeed rearrange itself gradually into a sphere.
如果小行星突然都有月亮那么大的话，它们会重新塑性变成一个球体。
The second asteroid it photographed, called Ida, was discovered to have a moon which appears as a small dot to the right of Ida in this picture.
它拍到的第二颗小行星命名爱达，人们发现它有一颗卫星，见图中爱达右侧的小点。
Those who study the solar system fall into the former camp. Every planet, asteroid, moon, mountain and crater has its name.
研究太阳系的天文学家属于前一个阵营，替每一行星、小行星、月亮、山岳及陨石坑都取了自己的名字。
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。
Unlike the moon or Mars, an asteroid would have little, if any, gravity to hold astronauts or vehicles to its surface, so an anchor would be necessary.
不同的是月球或火星，小行星不会有什么，如果有的话，重力举行宇航员或车辆在其表面，因此一个锚是必要的。
Their main military base was on Charon (Pluto's moon) with many strongholds in the main asteroid belt.
他们主要的军事基地位在凯伦星 （冥卫一），而且在小行星带曾经有好几座军事要塞。
Dactyl is the first moon of an asteroid ever discovered.
载克太1号是迄今发现的首颗小行星卫星。
If an asteroid were to suddenly become as big as a moon, it would indeed rearrange itself gradually into a sphere.
如果行星突然变得和月亮一样大，它就会真正重新安排逐渐变成一个球体。
If an asteroid were to suddenly become as big as a moon, it would indeed rearrange itself gradually into a sphere.
如果行星突然变得和月亮一样大，它就会真正重新安排逐渐变成一个球体。
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