This overview map made from Mars Orbiter camera images illustrates the path that the Mars Exploration Rover Spirit has taken from its first sol on the red planet through its 107th sol. As of sol 112 (April 26, 2004), Spirit has passed "Missoula" crater and sits approximately 1,900 meters (1.18 miles) away from its destination at the western base of the "Columbia Hills." While most of Spirit's journey has been over the very angular rocks that make up the ejecta fields surrounding "Bonneville" crater, the rover's next 50 or so sols will be spent traversing over martian plains that are dominated by rounder, vesicle-filled rocks.
Image Credit: NASA/JPL/Cornell/OSU/MSSS
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