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The planets closest to the Sun: Mercury, Venus Earth and Mars are composed of rock. The planets beyond the asteroid belt Jupiter, Saturn, Uranus and Neptune are made up of gases. Pluto is composed of rock and ice.

Also, it has an elliptical orbit and at times crosses Neptune's path. There are periods of up to 20 years where it was the 8th body orbiting the Sun and Neptune 9th. (That is, if you do not count Ceres which is located in the asteroid belt) This leads scientists to believe it is an asteroid and part of the Kuiper belt.

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14y ago

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