An ice planet or icy planet is a type of planet with an icy surface of volatiles such as water, ammonia, and methane. Ice planets consist of a global cryosphere.
Under a geophysical definition of planet, the small icy worlds of the Solar System qualify as icy planets. These include most of the planetary-mass moons, such as Ganymede, Titan, Europa, Enceladus, and Triton; Pluto, Orcus, Haumea, Makemake, Quaoar, Sedna, Gonggong, and Eris; and the largest . In June 2020, NASA reported that it is likely that with oceans, including some with oceans that may lie beneath a layer of surface ice, may be common in the Milky Way, based on mathematical modeling studies.
Characteristics and habitability
An ice planet's surface can be composed of
water,
methane,
ammonia,
carbon dioxide (known as "
dry ice"),
carbon monoxide,
nitrogen, and other volatiles, depending on its surface temperature. Ice planets would have surface temperatures below 260
Kelvin (−13 °C) if composed primarily of
water, below 180 K (−93 °C) if primarily composed of CO and
ammonia, and below 80 K (−193 °C) if composed primarily of methane.
On the surface, ice planets are hostile to life forms like those living on Earth because they are extremely cold. Many ice worlds likely have , warmed by internal heat or from another nearby body. Liquid subsurface water would provide habitable conditions for life, including fish, plankton, and . Subsurface plants as we know them could not exist because there is no sunlight to use for photosynthesis. Microorganisms can produce nutrients using specific chemicals (chemosynthesis) that may provide food and energy for other organisms. Some planets, if conditions are right, may have significant atmospheres and surface liquids like Saturn's moon Titan, which could be habitable for exotic forms of life.
Examples
In solar system
Although there are many icy objects in the
Solar System, none of them qualify as planets under the IAU definition of planet. However, most planetary-mass moons are ice-rock (e.g. Ganymede, Callisto,
Enceladus, Titan, and Triton) or even primarily ice (e.g. Mimas, Tethys, Rhea, and Iapetus) and so qualify as ice planets under geophysical definitions of the term. The largest
Kuiper belt objects, such as
Pluto,
Haumea, Makemake, Charon,
Quaoar, and Orcus
also qualify as such under geophysical definitions. Europa is also often considered an ice planet due to its surface ice, though its high density indicates that its interior is mostly rocky. The same is true for the scattered-disc object .
[Emily Lakdawalla et al., What Is A Planet? The Planetary Society, 21 April 2020]
Beyond solar system
Dozens of known exoplanets are very probably ice planets, given their orbits, surfaces, densities, and host stars. Examples of ice planets include Gliese 667 C d, Gliese 667 C g, Kepler-441b, OGLE-2005-BLG-390Lb, OGLE-2013-BLG-0341LBb, OGLE-2016-BLG-1195Lb and MOA-2007-BLG-192Lb.
See also
