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Telling time on the moon（图）
the moon time asteroids comets other rocky material
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2010/9/21
Ever since the solar system formed roughly five billion years ago, a steady barrage of asteroids, comets and other rocky material has pummeled the surfaces of planetary bodies. Earth’s surface shows l...
Astronomers discover the Moon is shrinking（图）
Astronomers the Moon shrinking
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2010/9/21
Freshly discovered scars on the face of the Moon reveal that this rocky satellite is shrinking at a relatively rapid pace, say researchers based in Germany and the US. Images collected by NASA's Lunar...