Before revision: Background The first NASA rover, Sojourner (on the Mars Pathfinder lander), and twin rovers Spirit and Opportunity, used a combination parachutes, retrorockets, and airbags for landing.
After revision: ofBackground The first NASA rover, Sojourner (on the Mars Pathfinder lander), and twin rovers Spirit and Opportunity, used a combination parachutes, retrorockets, and airbags for landing.