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Top image courtesy Earth Sciences and Image Analysis Laboratory, NASA Johnson Space Center; bottom image

by Nancy Atkinson on January 15, 2009

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Top image courtesy Earth Sciences and Image Analysis Laboratory, NASA Johnson Space Center; bottom image

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About

Nancy Atkinson is Universe Today's Senior Editor. She also is the host of the NASA Lunar Science Institute podcast and works with the Astronomy Cast and 365 Days of Astronomy podcasts. Nancy is also a NASA/JPL Solar System Ambassador.