Curiosity: Exploring Mars

Weighing 899 kilograms—nearly the size of a compact car—NASA's Curiosity rover was far too heavy for the airbag landing systems used by earlier Martian rovers. On August 6, 2012, after enduring the 'Seven Minutes of Terror' atmospheric entry, a hovering rocket-powered descent stage lowered Curiosity onto the floor of Gale Crater on nylon tethers using the first-ever Sky Crane maneuver. Its target was Aeolis Mons (Mount Sharp), a 5.5-kilometer-tall layered mountain rising from the crater center that preserves billions of years of Martian geological history.

Equipped with a radioisotope power generator and ten state-of-the-art instruments—including the ChemCam laser spectrometer and the Sample Analysis at Mars (SAM) suite—Curiosity drilled into ancient mudstones at Yellowknife Bay within its first year. Chemical analysis revealed fine-grained clay minerals, neutral pH water chemistry, and key biogenic elements (carbon, hydrogen, oxygen, sulfur, nitrogen, and phosphorus), proving that Gale Crater once hosted a calm, freshwater lake system billions of years ago.

Continuing its ascent up the sulfate-bearing foothills of Mount Sharp over more than a decade on Mars, Curiosity has detected complex organic molecules preserved in 3.5-billion-year-old sedimentary rocks, documented seasonal fluctuations in atmospheric methane, and measured surface radiation levels essential for planning future crewed expeditions to the Red Planet.