Is the smallest planet.
Its mass (weight) is 1/500th that of the Earth. Its
diameter is about 1/6 that of our planet.
Is the ninth planet in order from the
Sun. It is about 5.9 billion kilometers from the Sun.
Makes one complete orbit around the
Sun every 248 years.
Rotates on its axis slowly
when compared to Earth. It completes one rotation in about 6 days and 9
Is sometimes known as a double-planet because it has a moon (Charon) that orbits it.
Has a total of 1 satellite (or moons).