Far far away, at the very edge of the Solar System
lies Pluto, the ninth planet from the Sun. It is not
only much smaller and less massive than every other
planet, it is also smaller and less massive than seven
moons of other planets. It has a highly eccentric
orbit which takes it inside the orbit of Neptune. This
caused some debate regarding whether Pluto should even
be classified as a planet!
It has one natural satellite, Charon, which is half
the size of Pluto. Because they are comparable in
size, many consider them to be a double planet.
Pluto's atmosphere appears to extend out to include
Charon, which suggests that they may share an
atmosphere.
There are many other interesting and controversial
facts about this planet that you can learn if you
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