Under the surface of the dwarf planet Ceres are strange jumbled zones that are mixes of ice and rock, a new study finds. This research suggests that Ceres might still be warmed by radioactive material in its interior, scientists say. With a diameter of about 585 miles (940 kilometers), Ceres is by far the biggest member of the asteroid belt located between Mars and Jupiter. Previous remote analysis of Ceres using ground- and space-based telescopes suggested that it was not as dense as other large asteroids such as Vesta.
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