An undated artist rendering released by NASA shows the NASA Dawn spacecraft in orbit around the giant asteroid Vesta. After spending a year examining Vesta, Dawn is poised to depart and head to another asteroid, Ceres, where it will arrive in 2015.(AP Photo/NASA)

Associated Press
An undated artist rendering released by NASA shows the NASA Dawn spacecraft in orbit around the giant asteroid Vesta. After spending a year examining Vesta, Dawn is poised to depart and head to another asteroid, Ceres, where it will arrive in 2015.(AP Photo/NASA)
An undated artist rendering released by NASA shows the NASA Dawn spacecraft in orbit around the giant asteroid Vesta. After spending a year examining Vesta, Dawn is poised to depart and head to another asteroid, Ceres, where it will arrive in 2015.(AP Photo/NASA)
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