Pluto
Originally Pluto was the ninth planet in the Solar System but was reclassified in 2006 by the International Astronomical Union. Currently known as a dwarf planet. Pluto's orbit is on a pane that is different from the rest of the planets and is very elliptical taking it outside the orbit of Neptune and at times within it. Pluto has one large moon called Charon and four smaller moons. Charon is relatively large compared to Pluto and the two actually orbit a common point, making them a dual system in their own right.