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...requirements; its implementation remains the gold standard today."}}</ref> of present-day planetary protection. ...d parts of the spacecraft, so this was enough for a million-fold reduction of the originally low population).<ref name=JPL2011/> ...

|alma_mater = [[University of Oklahoma]] <br/> [[San Francisco State University]] ...]].<ref>[[Steven J. Dick]], "The Living Universe: NASA and the Development of Astrobiology", Rutgers University Press, 2005, pg. 148</ref><ref name="SETI ...