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1·Heat could be retained as debris fall back into impact craters, creating an insulating blanket.

当碎片落回撞击坑时，热量可以被保留下来，形成隔热层。

2·The Mariner spacecraft found that the surface of Mars, as well as that of its two moons, is pitted with impact craters formed by meteoroids falling in from space.

水手号宇宙飞船发现火星表面，还有它的两个卫星表面，都有由太空坠落的流星体造成的陨石坑。

3·From the small number of impact craters that appear on Martian lava flows, one can estimate that the planet was volcanically active as recently as a half-billion years ago—and may be active today.

从火星熔岩流上出现的少量陨石坑中，我们可以估计，在5亿年前，这个星球上的火山还很活跃——也许现在依然活跃。

4·Small meteorites have left impact craters all over the planet's surface.

这个行星的表面布满了小块陨石留下的撞击坑。

5·Many impact craters seen in the solar system were caused by such collisions.

太阳系中的许多冲撞坑都是由这种碰撞造成的。

6·The buried ice was spotted in debris thrown up in five recent northern hemisphere impact craters.

在北半球最近碰撞形成的五个陨石坑掀起的岩屑中，发现了埋藏的冰。

7·Deimos has a smooth surface due to a blanket of fragmental rock or regolith, except for the most recent impact craters.

火卫二因碎屑岩或风华层的覆盖而表面光滑，除了最近的撞击坑。

8·Ganymede, the largest moon in the solar system, has a dirty ice surface cut by fractures and peppered by impact craters.

这颗太阳系中最大的卫星，表面冰盖布满断层的切口和火山灰的粉末。

9·Based on a lunar analogy, one might expect several impact craters of at least 500km diameter to have been formed on Earth.

基于月球的对比，可以认为一些直径至少500公里的撞击坑在地球上形成。

10·Mimas, one of the smaller round moons of Saturn, sports Herschel crater, one of the larger impact craters in the entire Solar System.

土卫一，土星的一颗较小的卫星，却炫耀着全太阳系最大的撞击坑之一的赫歇尔环形山。