page_title: Ice planet
section_title: Pluto and candidates
hierarchical_section_title: Ice planet / Pluto and candidates
caption_attribution_description: English: With an estimated temperature of just 50K, OGLE-2005-BLG-390L b is the chilliest exoplanet yet discovered. (Artist's concept)
context_page_description: An ice planet is a theoretical type of exoplanet with an icy surface of volatiles such as water, ammonia, and methane. Ice planets consist of a global cryosphere. They are bigger versions of the small icy worlds of the Solar System, which includes the moons Europa, Enceladus, and Triton, the dwarf planets Pluto and Eris, and many other small Solar System bodies such as comets. In June 2020, NASA scientists reported that it's likely that exoplanets with oceans, including some oceans that may be frozen, may be common in the Milky Way galaxy, based on mathematical modeling studies.
context_section_description: Although there are many icy objects in the Solar System, there are no known ice planets (though Pluto was considered an ice planet until its reclassification in 2006). 
  If a 9th planet suggested in 2016 is found, it will be an ice planet of many times the earth's mass with a surface temperature potentially under 70K.
  There are several extrasolar ice planet candidates, including OGLE-2005-BLG-390Lb, OGLE-2013-BLG-0341L b and MOA-2007-BLG-192Lb.
caption: OGLE-2005-BLG-390Lb is likely an ice planet
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