insight

Nature 412, 209-213 (12 July 2001) | doi:10.1038/35084148

Decline and fall of the martian empire

Kevin Zahnle1

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"Are they worlds, or are they mere masses of matter? Are physical forces alone at work there or has evolution begotten something more complex, something not unakin to what we know on Earth as life? It is in this that lies the peculiar interest of Mars."

Percival Lowell (in ref. 1, p. 3)

  1. NASA Ames Research Center, Moffett Field, California 94035-1000, USA