Because at least one asteroid appears to be coated by a thin layer of ice. And just that kind of asteroidal frosting could have been the source of our water here on Earth.
至少有一个行星被一层薄薄的冰层覆盖，这些冰可能就是地球上水的来源。
2
These rocks are believed to be the result of an asteroidal prang that happened many millions of years ago and left a crater 460km across, which dominates Vesta's southern hemisphere.
这些岩石据说是几百万年前的小行星碰撞的结果，并在灶神星的南半球形成了一个跨度为460公里的陨石坑。
3
These rocks are believed to be the result of an asteroidal prang that happened many millions of years ago and left a crater 460km across, which dominates Vesta's southern hemisphere.