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彗星和小行星

网络the comets and the asteroids

彗星和小行星

彗星和小行星

彗星和小行星

the comets and the asteroids

空间探测 ... 彗星和小行星（ the comets and the asteroids）空间科学研究（ the space scientific research） ...

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OK , comets and asteroids. It might help if you think of. . . remember we talked about the two classes of planets in our solar system?

好，彗星和小行星，它们能帮到你记起 …还记得我们讲过的太阳系中两类行星吗？

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A : The Earth has always been subject to impacts by comets and asteroids , although big hits are very rare .

答：地球经常成为彗星和小行星撞击的目标，尽管大的撞击非常罕见。

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Comets and asteroids are often thought of as the same thing when they are in fact very different from one another.

通常我们认为彗星和小行星是一回事，其实他们是截然不同的。

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They say these sorts of things could have come from comets and asteroids .

他们解释道，这类物质可能来自彗星和小行星。

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relationship among asteroids, comets and meteoroid streams, and new topics in meteoroidal researches are stated.

流星群与彗星和小行星的相互关系以及流星群研究中的新课题。

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The remaining 10 per cent of material in the Zodiacal Cloud comes from Oort Cloud comets, Halley-type comets and asteroid collisions .

黄道云中其余 10%的物质来自奥尔特星云彗星、哈雷型彗星和小行星碰撞形成的彗星。

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