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Pluto, formal designation 134340 Pluto, is the second-most-massive known dwarf planet in the Solar System (after Eris) and the tenth-most-massive body observed directly orbiting the Sun. Originally classified as the ninth planet from the Sun, Pluto was recategorized as a dwarf planet and plutoid due to the discovery that it is one of several large bodies within the newly charted Kuiper belt.

Pluto, formal designation 134340 Pluto, is the second-most-massive known dwarf planet in the Solar System (after Eris) and the tenth-most-massive body observed directly orbiting the Sun. Originally classified as the ninth planet from the Sun, Pluto was recategorized as a dwarf planet and plutoid due to the discovery that it is one of several large bodies within the newly charted Kuiper belt.

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NASA's Pluto Discovery: Charon's Strange Mountain --"Has Geologists Stunned and Stumped"

NASA's Pluto Discovery: Charon's Strange Mountain --"Has Geologists Stunned and Stumped"

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Exploring Space Pluto images from discovery until today

Exploring Space Pluto images from discovery until today

Pluto Discovery Telescope, Lowell Observatory, Flagstaff, AZ

Pluto Discovery Telescope, Lowell Observatory, Flagstaff, AZ

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New Dwarf Planet Found at Solar System's Edge, Hints at Possible Faraway 'Planet X' | Space.com

New Dwarf Planet Found at Solar System's Edge, Hints at Possible Faraway 'Planet X' | Space.com

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Pluto images from discovery until today

Pluto images from discovery until today

A Hitchhiker's Guide to Space & Plasma Physics - Planets of Our Solar System Our solar system...

A Hitchhiker's Guide to Space & Plasma Physics - Planets of Our Solar System Our solar system...

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It's been an exciting week of Pluto discovery for the world and for one group of children in particular

It's been an exciting week of Pluto discovery for the world and for one group of children in particular

Learn about the history of Pluto's discovery and reclassification in this video adapted from NASA.

Learn about the history of Pluto's discovery and reclassification in this video adapted from NASA.

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