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。
We could do this in theory by studying an enormous impact crater, known as the South Pole-Aitken Basin.
「月球陨石坑观察与感卫星」太空总署的「月球陨石坑观察与感测卫星」（LCROSS），上个月撞入月球南极附近一个永久阴暗的陨石坑，探测下面是否埋藏了冰。
NASA's Lunar Crater Observation and Sensing Satellite, or LCROSS, last month slammed into one of moon's permanently shadowed craters near the south pole to study whether ice was buried underneath.
地球上的生命来自外太空，支持它的理论是撞上南极洲的陨石中发现了氮。
Nitrogen has been found in a meteorite that smashed into Antarctica, bolstering the theory that life on Earth came from outer space.
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