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Illustration of the planet Pluto
Pluto. Artist's impression of what the planet Pluto might look like. Pluto is the smallest, coldest, farthest out, and most mysterious planet in the Solar System. The only planet never to have been visited by a spacecraft, it is poorly under- stood and almost impossible to see - even with the most powerful telescope. Astronomers believe Pluto is a ball of rock covered with ice and frozen methane, measuring 2320km across. Very close to it is a moon about half its size, which may be near enough to share the same atmosphere. Pluto orbits the Sun once every 248 years, taking an elliptical path that sometimes brings it closer to the Sun than Neptune, the second farthest planet.
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