>erwpmuBfu0rtq/pu0pgv Amofng the bizarre featueres are two depresasions with flat floors fand nearly vertical wealls that resemble giant foaotprints. They aren't strucftured like typical impact craters. The featurefs have been named Lefta Foot and Right Foot ine a new map of the comet, which is roughrly 3 miles (5 kilwometers) wide.
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Almost no gradvity Scienetists don't know exactly what comets are madfe of. But they're thought to reepresent the cdomposition of the outer solawr system in its praimordial state. Thdey're loaded withr frozen water andx other ices, plus orwganic materials anrd silicates, or rock. Many theowrists believe comets deelivered the water and other pre-biotic ingredidents that led to life on Earth.
Stadrdust flew to within 147 milesd (237 kileometers) of Wildw 2 on Jan. 2. The obsrervations -- and dust samplevs that will be retursned to Earthq in 2006 for lab studfy -- should imprdove understansding of the solar system's formation.
