"Curiosity Rover Marks 4000 Days on Mars, Surviving Harsh Conditions"

NASA's Curiosity rover has reached a milestone of 4,000 "sols" (Martian days) on Mars since landing in 2012. The rover continues to gather evidence of minerals and rocks shaped by water, with a recent sample nicknamed "Sequoia" potentially showing evidence of sulfates formed in salty water billions of years ago. Curiosity has already found abundant sulfates and is searching for elusive carbonate reserves. Despite minor issues with its camera and wear on its drill and robotic arm, Curiosity remains in good health and has years of life left.