Mars rovers

American robotic rover exploring Jezero Crater on Mars

former NASA Mars rover

former NASA Mars rover

American robotic rover exploring Gale Crater on Mars

Mars lander

Mars mission by NASA, with rover named "Curiosity"

unmanned USSR spaceprobe

robotic space mission from NASA involving two Mars rovers, Spirit and Opportunity exploring the planet Mars

space exploration vehicle designed to move across the surface of Mars

Soviet Mars probe

Mars rover

former NASA Mars rover

PrOP-M (, Passability Estimating Vehicle for Mars or Device Evaluation Terrain—Mars) were two Soviet Mars rovers that were launched on the unsuccessful Mars 2 and Mars 3 missions in 1971. PrOP-M were the first rovers to be launched to Mars, 26 years before the first successful rover mission of NASA's Sojourner in 1997. Because the Mars 2 and Mars 3 missions failed, the existence of the rovers was kept secret for nearly 20 years.