These "planetary protection" requirements impose heavy financial burdens on missions, partially explaining why no robots have searched for life on the Red Planet's surface since NASA's twin Viking landers ceased operations three decades ago, researchers Alberto Fairen of Cornell University and Dirk Schulze-Makuch of Washington State University write in a commentary published online today (June 27) in the journal Nature Geoscience.
Further, such restrictions are unnecessary, because Earth life has doubtless made it to the neighboring Red Planet already inside chunks of rock blasted off our planet by asteroid strikes, the scientists say. []
"If Earth micro-organisms can thrive on Mars, they almost certainly already do; and if they cannot, the should be of no concern, as it would simply not survive," Fairen and Schulze-Makuch write in the commentary. "We cannot see how our current program of Mars exploration might pose any real threat to a possible Martian biosphere."
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