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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New Horizons Pluto Flyby

New Horizons Pluto Flyby

"Long live the Pioneer."

"Long live the Pioneer."

First Close-up of Pluto! - image released moments ago

First Close-up of Pluto! - image released moments ago

I combined today's colour photo of Pluto with the recent high-rez one.

I combined today's colour photo of Pluto with the recent high-rez one.

Want to see what New Horizons is doing right now?  Without the 4 light-hour delay?

Want to see what New Horizons is doing right now? Without the 4 light-hour delay?

Quote by Phil Plait of Bad Astronomy, Image by NASA New Horizons

Quote by Phil Plait of Bad Astronomy, Image by NASA New Horizons

New Horizon's approach to Pluto, May 26 - July 12

New Horizon's approach to Pluto, May 26 - July 12

New Horizon's approach to Pluto, May 26 - July 11

New Horizon's approach to Pluto, May 26 - July 11

3.999.999 km and counting

3.999.999 km and counting

New Horizons continues its approach to Pluto

New Horizons continues its approach to Pluto

I don't understand why people aren't more excited about this. This is the best picture of Pluto and Charon we've ever had, and it only gets better from here!

I don't understand why people aren't more excited about this. This is the best picture of Pluto and Charon we've ever had, and it only gets better from here!