Kuiper belt objects are small icy bodies—including some dwarf planets—that lie beyond the orbit of Neptune.
Once considered the ninth planet in our system, the dwarf planet Pluto, for example, is one of the largest Kuiper belt objects, at about 1,400 miles (2,300 kilometers) wide. Dozens of the other objects are hundreds of miles across, and more are being discovered every year.
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Kuiper belt objects are small icy bodies—including some dwarf planets—that lie beyond the orbit of Neptune.
Once considered the ninth planet in our system, the dwarf planet Pluto, for example, is one of the largest Kuiper belt objects, at about 1,400 miles (2,300 kilometers) wide. Dozens of the other objects are hundreds of miles across, and more are being discovered every year.
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