This sharp color image [ http://mpfwww.jpl.nasa.gov/ops/sol19-20.html ] featuring Mars rock Yogi [ http://antwrp.gsfc.nasa.gov/apod/ap970716.html ] and the rolling Sojourner [ http://antwrp.gsfc.nasa.gov/apod/ap970707.html ] robot shows off Yogi's startling two-toned surface. Yogi appears to be leaning into the prevailing winds causing some to suggest that its color contrast may be caused by the accumulation of rust colored dust [ http://antwrp.gsfc.nasa.gov/apod/ap970804.html ] on its windward face. The Pathfinder spacecraft [ http://mpfwww.jpl.nasa.gov/mpf/mission.html ], now the Sagan Memorial Station, has ended the primary mission phase after returning a scientific bonanza [ http://www.jpl.nasa.gov/marsnews/science.html ] from the surface of Mars [ http://antwrp.gsfc.nasa.gov/apod/ap970628.html ]. The Sojourner robot has now traveled 171 feet on the martian surface, circumnavigated the lander, and also produced a wealth of data and images [ http://mpfwww.jpl.nasa.gov/ops/rover.html ]. Entering the extended mission phase of operations, controllers will concentrate on conserving battery power while continuing to explore [ http://mpfwww.jpl.nasa.gov/default.html ] the red planet [ http://www-personal.engin.umich.edu/~cerebus/mars/index.html ].