Pluto

Dwarf Planet

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Pluto is a dwarf planet in the Kuiper belt, a ring of bodies beyond Neptune. It was the first Kuiper belt object to be discovered. Pluto was discovered by Clyde Tombaugh in 1930 and was originally considered to be the ninth planet from the Sun. After 1992, its planethood was questioned following the discovery of several objects of similar size in the Kuiper belt. In 2005, Eris, which is 27% more massive than Pluto, was discovered. This led the International Astronomical Union to define the term "planet" formally. That definition excluded Pluto and reclassified it as a dwarf planet.

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Charon (Pluto's moon) in enhanced color

Charon (Pluto's moon) in enhanced color

This painfully short video is the best look we’ve ever gotten at a planet orbiting a star outside our Solar System.

This painfully short video is the best look we’ve ever gotten at a planet orbiting a star outside our Solar System.

Centerfold says Pluto is a Planet!

Centerfold says Pluto is a Planet!

Photobombing Level - Interstellar

Photobombing Level - Interstellar

I got an image of Pluto from the New Horizons mission printed out and framed!

I got an image of Pluto from the New Horizons mission printed out and framed!

Latest pictures of Pluto and Charon from New Horizons

Latest pictures of Pluto and Charon from New Horizons

New Horizons Image of Pluto is quite zoomy

New Horizons Image of Pluto is quite zoomy

New Horizons, Pluto

New Horizons, Pluto

The Bad Luck Brian of Babylon 5 has sailed on to new horizons....

The Bad Luck Brian of Babylon 5 has sailed on to new horizons....

Not Earth

Not Earth

Astronomy Picture of the Day 20160609

Astronomy Picture of the Day 20160609