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.

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"

The Pluto Discovery Telescope, Lowell Observatory, Flagstaff, Arizona

The Pluto Discovery Telescope, Lowell Observatory, Flagstaff, Arizona

Pluto Discovery Telescope, Lowell Observatory, Flagstaff, AZ

Pluto Discovery Telescope, Lowell Observatory, Flagstaff, AZ

In celebration of Pluto's discovery day. (Part of) The Pioneer Plaque By Shark Tank Tattoo in Easthampton MA

In celebration of Pluto's discovery day. (Part of) The Pioneer Plaque By Shark Tank Tattoo in Easthampton MA

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.

Northern Pluto February 27 2016 via NASA Gaze across the frozen canyons of northern Pluto in this contrast enhanced color scene imaged last July by the New Horizons spacecraft. Currently known as Lowell Regio the region has been informally named for Percival Lowell founder of the Lowell Observatory. Also famous for his speculation that there were canals on Mars in 1906 Lowell started the search that ultimately led to Pluto's discovery. Pluto's North Pole itself is above and left of center in…

Northern Pluto February 27 2016 via NASA Gaze across the frozen canyons of northern Pluto in this contrast enhanced color scene imaged last July by the New Horizons spacecraft. Currently known as Lowell Regio the region has been informally named for Percival Lowell founder of the Lowell Observatory. Also famous for his speculation that there were canals on Mars in 1906 Lowell started the search that ultimately led to Pluto's discovery. Pluto's North Pole itself is above and left of center in…

Pluto images from discovery until today [2830x500] : space

Pluto images from discovery until today [2830x500] : space

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

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