The original mission was scheduled to last 90 Martian days, but that estimate has proved to be far short of the rovers' capabilities. A Martian day lasts 24 hours and 37 minutes of Earth time while a Martian year lasts 686.98 Earth days.
The photos in the gallery are presented according to their rank in the voting.
1. Spirit captured this sunset on Mars. The sun would appear to be about two-thirds the size as seen from Earth. Studying sunset and twilight images helped scientists better understand Mars' atmosphere.
January 24, 2007 7:52 AM PST
Photo by: NASA/JPL/Texas A&M/Cornell
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