Mars 2020 Rover's 7-Foot-Long Robotic Arm Installed
In this image, taken on June 21, 2019, engineers at NASA's Jet Propulsion Laboratory in Pasadena, California, install the main robotic arm on the Mars 2020 rover. (A smaller arm to handle Mars samples will be installed inside the rover as well.) The main arm includes five electrical motors and five joints (known as the shoulder azimuth joint, shoulder elevation joint, elbow joint, wrist joint an