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1·We could do this in theory by studying an enormous impact crater, known as the South Pole-Aitken Basin.

理论上，我们可以通过研究一个名为南极-艾特肯盆地的巨大陨石坑来做到这一点。

2·An iridium-enriched sediment layer and a large impact crater in the Yucatn provide evidence that a large meteorite struck Earth about 65 million years ago.

尤卡坦半岛上富含铱的沉积层和一个巨大的陨石坑提供了证据，证明了约6500万年前，一颗大型陨石撞击了地球。

3·In other deposits, they're either sedimentary, or in the center of an impact crater.

其它矿藏要么是由沉淀物生成的，要么处于撞击火山的中心。

4·This image shows part of a 7.4-mile-diameter impact crater on Mars' southern hemisphere.

这张照片展示了位于火星南半球一个直径11公里冲击陨坑的一部分。

5·For scale, the large impact crater in lower right corner is about 18.5 miles, or 30 km, wide.

右下角的巨大陨石坑按比例宽约18.5英里，或30公里。

6·This image shows the west-facing side of an impact crater in the mid-latitudes of Mars' northern hemisphere.

这幅图片显示了火星北半球中纬度地区的一个面向西侧的陨石坑。

7·They conducted surveys at numerous sites in Mexico, including a spot called El Peñón, near the impact crater.

他们在墨西哥的很多地区，包括一个在陨石坑附近的叫做El Peñón的地区进行了调查。

8·In the centre of the image, the floor of an impact crater almost 50 km wide is covered in dark material.

在图像的中心，一个陨石坑地面将近50公里宽覆盖着黑色的物质。

9·In contrast, the 34-km-wide impact crater to the lower right of the image is largely filled with light material.

相比之下，34公里宽的陨石坑，以图像的右下角，主要是充满了轻型材料。

10·Named after the famous Portuguese navigator and explorer Ferdinand Magellan, the impact crater is about 100 km across.

麦哲伦陨石坑以葡萄牙著名航海家麦哲伦的名字命名，直径约100公里。