“Mars 2020 Rover's 7-Foot-Long Robotic Arm Installed”. mars.nasa.gov (28 June 2019). 1 July 2019閲覧。 “The main arm includes five electrical motors and five joints (known as the shoulder azimuth joint, shoulder elevation joint, elbow joint, wrist joint and turret joint). Measuring 7 feet (2.1 meters) long, the arm will allow the rover to work as a human geologist would: by holding and using science tools with its turret, which is essentially its "hand".” この記述には、アメリカ合衆国内でパブリックドメインとなっている記述を含む。