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"A dwarf planet is shining two bright lights at a NASA spacecraft right now, and our smartest scientists are unsure what they are. As bizarre as that sentence sounds, that's the situation with Ceres — the largest object in the asteroid belt between Mars and Jupiter, officially designated as a dwarf planet (the same category as Pluto). "
On the other hand, the location of the two bright spots so close together may be an indication that they have a geologic origin, such as some sort of volcanic process, possibly even ice volcanoes. According to Chris Russell, principal investigator for the Dawn mission, the positioning of the bright spots within the same area may indicate "a volcano-like origin of the spots," but scientists will have to wait for higher resolution images before making such interpretations. Scientists don't think the spots comprise lava similar to that seen on Earth, since that would shine more brightly.