NASA’s Curiosity rover has reached a key geological boundary on Mars after a steep climb, giving scientists a new opportunity to study how the planet’s ancient environment changed. The maneuver left Curiosity parked at an approximate 24-degree tilt, close to the mission’s contact-science tilt record of 27 degrees. A Geological Break In Mars’ Sedimentary RecordThe feature Curiosity is investigating is described by NASA scientists as a candidate “erosional supersurface.” NASA’s Mars rover Curiosity acquired this image, showing the rover arm in action in the “Longquimay” workspace at the top of a steep climb. NASA scientists plan to use the measurement to assess the consistency of sand composition along Curiosity’s traverse.