Steve Squyres, the indefatigable principal investigator for NASA's Mars rover missions, sells the seductive charms of the red planet better than just about anyone. But as chairman of the planetary science decadal survey, a US National Academies study that will decide on NASA's Solar System mission priorities for 2013-22, he has to play a different part: that of the dispassionate and disinterested pan-planetarian.
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