The older, smaller cousin of NASA's huge Mars rover Curiosity is quietly celebrating a big milestone today — nine years on the surface of the Red Planet. NASA's Opportunity rover landed on Mars the night of Jan. 24, 2004 PST (just after midnight EST on Jan. 25), three weeks after its twin, Spirit, touched down. Spirit stopped operating in 2010, but Opportunity is still going strong, helping scientists better understand the Red Planet's wetter, warmer past. "No one could've imagined how good the exploration and scientific discovery would be for this vehicle, looking from the perspective of nine years ago," said John Callas,...
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