Hollows on Mercury

NASA's MESSENGER spacecraft discovered strange hollows on the surface of 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. 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.