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Because it is so far away, (5,900,000,000 miles) from the sun, very little is known about Pluto except that it is a very cold, barren and rocky world. It is also the smallest of the planets, smaller even than our moon, around 2250 km. Pluto's gravitational force is sufficient for it to have a moon, though. The moon, Cheron, is almost as big as Pluto itself. It is also oprbits only 10,500 km away from Pluto. It was very hard to discover, therfore, and was not seen before 1940, and when it was, astronomers thought that Pluto and Cheron were both a single planet. |
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