Ceres (dwarf planet) - Wikipedia, the free encyclopedia:
"Ceres, formally 1 Ceres, is the only dwarf planet in the inner Solar System, and the largest asteroid.[19][20][21] It is a rock–ice body some 950 km (590 mi) in diameter, and though the smallest identified dwarf planet, it constitutes a third of the mass of the asteroid belt.[22][23] Discovered on 1 January 1801 by Giuseppe Piazzi,[24] it was the first asteroid to be identified, though it was classified as a planet at the time.[25] It is named after Ceres, the Roman goddess of growing plants, the harvest, and motherly love."
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