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1·So to talk about where meteorites come from, we need to talk about comets and asteroids.

那么讲到流星体从何而来，我们就需要讨论下彗星和小行星。

2·Roids are, for the most part anyway, they are just smaller bits of asteroids and comets.

在很大程度上，Roids 只是小行星和彗星的小碎片。

3·Rubin suggests that asteroids' heat could have derived from collisions between asteroids.

鲁宾认为，小行星的热量可能来自小行星之间的碰撞。

4·Earth's crust contains very little of this element, but most asteroids contain a lot more.

地壳中含有的这种元素很少，但大多数小行星上的要多得多。

5·I'm not going to go into any depth on comets and asteroids now, but we'll come back later and do that.

我现在不打算深入讨论彗星和小行星了，但是我们稍后会再回到这个点上，讨论这方面的内容。

6·The solar system also has two analogous classes of objects, smaller than planets—namely, asteroids and comets.

太阳系也有两类类似的物体，比行星还小——即小行星和彗星。

7·These asteroids are like the terrestrial planets, in that they're composed mostly of rocky material and metals.

这些小行星像类地行星一样，主要由岩石物质和金属构成。

8·The Sun is the hub of a huge rotating system consisting of nine planets, their satellites, and numerous small bodies, including asteroids, comets, and meteoroids.

太阳是一个巨大的旋转系统的中心，这个旋转系统由九大行星、它们的卫星和无数的小天体组成，包括小行星、彗星和流星体。

9·Skeptics have argued that a single impact would raise an asteroid's overall temperature very little and that asteroids would cool too quickly between impacts to accumulate much heat.

怀疑派认为，一次撞击只会使小行星的整体温度上升很小，而且小行星在两次撞击之间会迅速冷却，从而无法积聚大量热量。

10·A recent discovery that asteroids are highly porous makes Rubin's hypothesis more plausible.

最近的一项发现表明小行星非常多孔，这使得鲁宾的假设更加可信。

小行星

1·Roids are, for the most part anyway, they are just smaller bits of asteroids and comets.

在很大程度上，Roids 只是小行星和彗星的小碎片。

2·So to talk about where meteorites come from, we need to talk about comets and asteroids.

那么讲到流星体从何而来，我们就需要讨论下彗星和小行星。

3·The solar system also has two analogous classes of objects, smaller than planets—namely, asteroids and comets.

太阳系也有两类类似的物体，比行星还小——即小行星和彗星。

4·These asteroids are like the terrestrial planets, in that they're composed mostly of rocky material and metals.

这些小行星像类地行星一样，主要由岩石物质和金属构成。

5·The Sun is the hub of a huge rotating system consisting of nine planets, their satellites, and numerous small bodies, including asteroids, comets, and meteoroids.

太阳是一个巨大的旋转系统的中心，这个旋转系统由九大行星、它们的卫星和无数的小天体组成，包括小行星、彗星和流星体。

(1)asteroid belt小行星带