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Demoting Pluto: The Discovery of Dwarf Planets

By Steve Kortenkamp
eBook
$9.99
By Steve Kortenkamp
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When is a planet not a planet? Dwarf planets orbit the sun, are solid bodies, and are not moons. But they are not considered regular planets. Learn more about these spherical oddities and why Pluto is still hotly debated today.

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KidsScience & Technology - KidsAstronomy - Kids