The first of these objects to be discovered has been reclassified as a dwarf planet. Which object is it?

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Multiple Choice

The first of these objects to be discovered has been reclassified as a dwarf planet. Which object is it?

Explanation:
Discovered earliest among the options, Ceres holds the key. It was found in 1801 and, over the years, was labeled a planet, then reclassified as an asteroid, and finally, in 2006, designated a dwarf planet by the IAU. That makes it the first object in the list to be discovered and to have the status of a dwarf planet, which is exactly what the question notes. The other objects were discovered later (Haumea in 2004, Pluto in 1930) or, in Vesta’s case, are categorized as a large asteroid rather than a dwarf planet (though Pluto is a dwarf planet now, it wasn’t the first discovered among these).

Discovered earliest among the options, Ceres holds the key. It was found in 1801 and, over the years, was labeled a planet, then reclassified as an asteroid, and finally, in 2006, designated a dwarf planet by the IAU. That makes it the first object in the list to be discovered and to have the status of a dwarf planet, which is exactly what the question notes. The other objects were discovered later (Haumea in 2004, Pluto in 1930) or, in Vesta’s case, are categorized as a large asteroid rather than a dwarf planet (though Pluto is a dwarf planet now, it wasn’t the first discovered among these).

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