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Hollows on Mercury

CreditNASA/Johns Hopkins University Applied Physics Laboratory/Carnegie 
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NASA's MESSENGER spacecraft discovered strange hollows on the surface of Mercury.

NASA's MESSENGER spacecraft discovered strange hollows on the surface of Mercury. Images taken from orbit reveal thousands of peculiar depressions at a variety of longitudes and latitudes, ranging in size from 60 feet to over a mile across and 60 to 120 feet deep.