NASA’s Curiosity rover has now been exploring Mars for nine years. The car-sized robot launched in November 2011 and touched down inside Mars’ 96-mile-wide (154 kilometers) Gale Crater on the night of Aug. 5, 2012. (The landing occurred on Aug. 6 Eastern time, but it was still Aug. 5 in California, where NASA’s Jet Propulsion Laboratory, which ...