NASA's Curiosity rover is doing well after fighting dust, wind and age for 4,000 Red Planet days.
Curiosity recently passed 4,000 "sols," or Red Planet days, on Mars since landing on Aug. 5, 2012. (One sol is slightly longer than an Earth day — about 24 hours and 40 minutes.) The rover is a key part of NASA's search for life on Mars and continues to pull up evidence of minerals, rocks and other parts of the environment shaped by water.
