The Kuiper Belt is the largest mapped structure in our planetary system, three times as big as all the territory from the sun out to Neptune's orbit.

Alan Stern

Alan Stern

Belt Big Largest Neptune Orbit Our Out Planetary Structure Sun System Territory Three Times

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The Kuiper Belt is the largest structure in the solar system. We used to think Pluto was a misfit.

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Going to the Kuiper Belt is like an archaeological dig into the history of the solar system.

As a planetary scientist, I don't know what else to call Pluto: It's big and round and thousands of miles wide.

If you put Earth out beyond Neptune, you wouldn't be able to call it a planet because it couldn't clear its zone.

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Just as a Chihuahua is still a dog, these ice dwarfs are still planetary bodies.

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