Pluto

Pluto is a dwarf planet orbiting the Sun.

Characteristics
Pluto is a dwarf planet within the Kuiper Belt. It is also in a binary system with its moon Charon.

Atmosphere
Pluto has a temporary atmosphere that forms when Pluto makes a close approach to the Sun. The temporary atmosphere is mainly methane and nitrogen.

Sputnik-Plantia Glacier
The Sputnik-Plantia Glacier is a glacier on Pluto 1,000 kilometers in diameter, making it visible from space. The glacier is also sometimes considered a "heart" of Pluto.