The surface of the moon is pitted with craters.
月亮的表面布满陨石坑。
把弹坑放那里面。
On Mars, there are relatively few craters less than 5 kilometers in diameter.
在火星上，直径小于5公里的陨石坑相对较少。
From radio survey data, we know that the basin contains lots of smaller craters.
根据无线电测量数据，我们可以得知盆地里有许多较小的陨石坑。
However, Martian craters get filled in considerably faster than their lunar counterparts.
然而，火星陨石坑被填满的速度比月球陨石坑快很多。
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。
Some wells are vast, open craters with hundreds of steps paving each sloping side, often in tiers.
有些井是露天的巨坑，每个斜边都有几百级台阶，通常是一层一层的。
In other areas, you've got canyons, ripped valleys, meteo craters, lava domes, these lava formations that look like giant pancakes.
在其他地区，你会看到峡谷、裂谷、陨石坑、熔岩圆顶，这些熔岩构造的形状看起来就像巨大的煎饼。
To date, several such secondary craters have been found along Mexico's Yucatan Peninsula, and heat-shocked quartz has been found both in Mexico and in Haiti.
到目前为止，在墨西哥尤卡坦半岛已经发现了几个这样的二级陨石坑，而且，在墨西哥和海地都发现了热休克石英。
You know planetary researchers love studying deep craters to learn about the impacts that created them, and how they redistributed pieces of the planet's crust.
我们知道，行星研究人员喜欢研究深深的陨石坑，以了解造成这些陨石坑的撞击，以及它们是如何重新分配行星的地壳物质的。
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。
Massive projectiles striking much larger bodies create various kinds of craters, including multi-ring basins—the largest geologic features observed on planets and moons.
巨大的抛射物撞击更大的天体，创造了各种各样的陨石坑，包括多环盆地——这是在行星和卫星上观察到的最大的地质特征。
Massive projectiles striking much larger bodies create various kinds of craters, including "multi-ring basins"—the largest geologic features observed on planets and moons.
大量的抛射物撞击更大的天体，形成各种各样的陨石坑，包括“多环盆地”——在行星和卫星上观察到的最大的地质特征。
As on the Moon, the extent of large impact cratering (i.e. craters too big to have been filled in by erosion since they were formed) serves as an age indicator for the Martian surface.
与月球上相同，那些巨大陨石坑的范围（例如，那些巨大到自形成后尚未被尘埃填满的陨石坑）标志着火星表面的年龄。
Any water molecules that found their way to the floors of craters near the moon's poles, that water would be perpetually frozen, because the floors of those craters are always in shadow.
只要找到了通向月球两极附近陨石坑底部的路，这些水分子就会永远冻结，因为这些陨石坑的底部总是在阴暗处。
If we had rock samples to study, we'd know whether these small craters were formed by impacts during the final stages of planetary formation, or if they resulted from later meteor showers.
如果我们有岩石样本用于研究，我们就能知道，这些小陨石坑是在行星形成的最后阶段被撞击形成的，还是后来的流星雨造成的。
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。
The far side of the moon is of particular interest to scientists because it has a lot of deep craters, more so than the familiar near side.
科学家们对月球的背面尤其感兴趣，因为它有许多深环形山，比我们熟悉的一面要多。
Also, large blocks thrown aside by the impact would form secondary craters surrounding the main crater.
此外，撞击留下的大块物质会在主火山口周围形成二级火山口。
Craters on Mercury are named after artists, musicians and writers.
水星上的陨石坑均以艺术家，音乐家和作家的名字命名。
Small bright craters in the image are probably fairly young features.
图中那些精巧的小弹坑都是相当年轻的特征（意即成形没多少时间）。
"There's craters and meteoroids about to hit our planet." She said.
她说，“太空中的流星和陨石可能会撞击我们的地球，我们已经准备好应对方法了。”
Several space missions have detected water ice in craters at the lunar poles.
多项空间勘测研究任务都在月球的坑洞中发现了有水所凝结成的冰的存在。
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。
The Moon was once thought to be dry. Then came hints of ice in the polar craters.
月球曾被认为很干燥，而后又有迹象显示在极地的月坑有冰。
Scientists speculate there is water-ice in the planet's permanently Shadowed craters.
科学家预测在常年背光的火山口处有刨冰存在。
There they had remained trapped within dark and frigid craters that never see the Sun.
在那里，由于常年不见太阳，它们才能在又黑又冷的环形山内长期保存下来。
There they had remained trapped within dark and frigid craters that never see the Sun.
在那里，由于常年不见太阳，它们才能在又黑又冷的环形山内长期保存下来。
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