What are the bright spots on Ceres, the largest known asteroid? No one knows, including scientists working on NASA’s Dawn mission, which begins orbiting Ceres on Friday. The two reflective spots, in a 57-mile-wide crater, could be ice or salt, the scientists speculate. “The team is really, really excited about this feature, because it is unique in the solar system,” Carol Raymond, the mission’s deputy principal investigator, said in a news conference Monday. “The mystery will be solved, but it is one that’s really got us on the edge of our seats.”
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