If bacterial life did arise on an Earth-like early Mars, we should be able to find its fossil remains preserved in those red rocks
We seldom notice air, but there's more going on in that cubic foot of the ether in front of our faces than most of us would ever guess
While Comet Shoemaker-Levy 9 is history, space scientists are beginning to piece together the details of its pyrotechnic encounter with Jupiter last July
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