Pluto is a dwarf planet in the Kuiper belt. It has rugged icy mountains and flat ice plains. Great blocks of Pluto's water ice crust are jammed together. The plains have rugged icy craters. Cryovolcanoes have been spotted on the surface.

File:Pluto and Charon.jpg
Pluto and Charon

From 1930 to 2006, Pluto was considered a regular planet.