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The bright spots visible on the surface of Ceres - the biggest object in the main asteroid belt - left everyone wondering as to what they could be. If water was out of the question, then what could they be? ÃÛÑ¿´«Ã½â€™s Jonathan Amos talks to Andreas Nathues of the Max Planck Institute for Solar System Research in Goettingen, Germany about the answers new data from the Dawn spacecraft has provided. (Photo: Ceres spots © NASA)
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