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 startling 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 . ... NASA Web Site Statements, Warnings, and Disclaimers . NASA Official: Jay Norris. ... A service of: LHEA at NASA / GSFC . ...