Six brief visits by the astronauts weren't enough. With the surface area of Africa and Australia combined, says geo-physicist Bruce Campbell, Earth's moon still has a lot more to tell us.rnMore than three billion years of the solar system's history lies there, from an ancient era of heavy asteroid bombardment to the thump of pebble- and grain-size meteorites today. Earth's impact record is largely erased by erosion and plate tectonics, or buried by vegetation and oceans. But the moon's is merely obscured by a layer of fine dust. Campbell is unveiling that hidden record.
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