Ice Planet

An ice planet is a type of planet with an icy surface. Ice planets consist of a global cryosphere. Ice planets are bigger versions of Sol System's icy moons such as Europa, Enceladus, and Triton; dwarf planets Pluto and Eris, and many other icy bodies. Planet Ogle is a near perfect example of this type.

Characteristics and habitability
Ice planets usually appear nearly white with geometric albedos of more than 0.9. An ice planet's surface can be composed of water, methane, ammonia, carbon dioxide (known as "dry ice"), carbon monoxide, or other volatiles, depending on its surface temperature. Ice planets would have surface temperatures below 260 K if composed primarily of water, below 180 K if primarily composed of CO2 and ammonia, and below 80 K if composed primarily of methane.

Ice planets are usually hostile to carbon-based life because they are very cold, at least on the surface. Many ice planets may have subsurface oceans, warmed by their cores or tidal forces from another nearby body, specifically gas giants. Liquid subsurface water can provide habitable conditions for life, including fish, plankton, and microorganisms. Subsurface plants and microorganisms would not perform photosynthesis because sunlight is blocked by overlying ice; instead they produce nutrients using specific chemicals (chemosynthesis). Some worlds, if conditions are right, have significant atmospheres and surface liquids like Saturn's moon Titan which is habitable for exotic life forms.