Pluto is the ninth planet from the Sun. It is the smallest planet in the solar system. Pluto is smaller than Earth's moon. If Earth were the size of the ball used in playing Jacks, Pluto would be the size of a peppercorn.
Pluto is one of the outer planets. The other outer planets are Jupiter, Saturn, Uranus, and Neptune. Pluto is the farthest known planet from the Sun. It can only be seen through the largest telescopes. Even through a telescope, Pluto looks like a faint star. It is so far away, no spacecraft has visited it.
