Mars Rocks, Sojourner Rolls . ... Credit Copyright: IMP Team , JPL , NASA Explanation: This sharp color image featuring Mars rock Yogi and the rolling Sojourner robot shows off Yogi's two-toned surface. ... The Pathfinder spacecraft , now the Sagan Memorial Station, has ended the primary mission phase after returning a scientific bonanza from the surface of Mars . ... Mars Pathfinder and Soujourner landed on July 4, 1997 and lasted about 3 months, well beyond their designed lifetime . ...