You can follow the discussion on New Bot Day! Welcome to the Sojourner rover! Landed on Mars in 1997 as part of NASA’s Pathfinder mission and named for abolitionist and activist Sojourner Truth. Expected to operate 7 days, it operated 85. A proud addition to my collection! without having to leave a comment. Cool, huh? Just enter your email address in the form here below and you’re all set.