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[时差N小时] 时差N小时:为何月球上没有餐厅(上)
Why are there no restaurants on the moon? Great food. No atmosphere. The atmosphere is the layer of gases that surrounds a planet or other massive body. Although our atmosphere extends for tens of mi2012-02-01 编辑：beck
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[时差N小时] 时差N小时:为何月球上没有餐厅(下)
But more than these kinds of natural processes are needed to have an atmosphere. You also need gravity. Without sufficient gravity, any gases will just leak out into space and be gone. Earth loses so2012-02-02 编辑：beck
