Pluto

When it was discovered in 1930, Pluto was classified as the ninth furthest planet from the Sun, however it has since been demoted to dwarf planet status. This is due to observations of similar sized bodies in the Kuiper Belt that Pluto calls home, hence it did not meet one of the three criteria that the International Astronomical Union has to define a planet, it ‘has not cleaned its neighbouring region of other objects’. Pluto has five moons of its own but is only about one sixth of the mass of our Moon. When NASA’s New Horizons visited Pluto in 2015 it discovered frozen methane dunes on the dwarf planet's surface.

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