Site for Next Mars Mission Debated - Scientists are scrambling to find an alternative landing site for a long-armed robot set to launch this summer on a mission to dig into Mars' icy north pole to search for signs of primitive life.
The original landing spot was nixed after images beamed back by the eagle-eyed Mars Reconnaissance Orbiter unexpectedly showed scores of bus-sized boulders littered over old crater rims on flat plains.
The gigantic rocks pose a danger to NASA's Phoenix Mars lander, which unlike the rolling twin rovers, will be stationary, mission principal investigator Peter Smith of the University of Arizona said during a news teleconference Thursday.
Scientists scouring images of the Martian arctic have narrowed options down to three possible candidates for where the spacecraft can safely touch down. They have until March to choose a destination.