Editing Glacier (section)

== On other planets ==
{{main|Glaciers on Mars|Sputnik Planitia}}
[[File:Wide_view_of_glacier_showing_image_field.JPG|thumb|[[Protonilus Mensae]], [[Ismenius Lacus quadrangle]], Mars]]
The polar ice caps of [[Mars]] show geologic evidence of glacial deposits. The south polar cap is especially comparable to glaciers on Earth.<ref>{{cite web|url=http://www.lpi.usra.edu/meetings/polar2003/pdf/8112.pdf |archive-url=https://web.archive.org/web/20080227091117/http://www.lpi.usra.edu/meetings/polar2003/pdf/8112.pdf |archive-date=2008-02-27 |url-status=live |title=Kargel, J.S. et al.:''Martian Polar Ice Sheets and Mid-Latitude Debris-Rich Glaciers, and Terrestrial Analogs'', Third International Conference on Mars Polar Science and Exploration, Alberta, Canada, October 13–17, 2003 (pdf 970 Kb) |access-date=2013-01-04}}</ref> Topographical features and computer models indicate the existence of more glaciers in Mars' past.<ref>{{cite web|url=http://www.esa.int/SPECIALS/Mars_Express/SEMS3PMZCIE_0.html |title=Martian glaciers: did they originate from the atmosphere? ESA Mars Express, 20 January 2006 |publisher=Esa.int |date=2006-01-20 |access-date=2013-01-04}}</ref> At mid-latitudes, between 35° and 65° north or south, Martian glaciers are affected by the thin Martian atmosphere. Because of the low atmospheric pressure, ablation near the surface is solely caused by [[Sublimation (phase transition)|sublimation]], not [[melting]]. As on Earth, many glaciers are covered with a layer of rocks which insulates the ice. A radar instrument on board the [[Mars Reconnaissance Orbiter]] found ice under a thin layer of rocks in formations called [[lobate debris apron]]s (LDAs).<ref>Head, J. et al. 2005. Tropical to mid-latitude snow and ice accumulation, flow and glaciation on Mars. Nature: 434. 346–350</ref><ref>Plaut, J. et al. 2008. Radar Evidence for Ice in Lobate Debris Aprons in the Mid-Northern Latitudes of Mars. Lunar and Planetary Science XXXIX. 2290.pdf</ref><ref>Holt, J. et al. 2008. Radar Sounding Evidence for Ice within Lobate Debris Aprons near Hellas Basin, Mid-Southern Latitudes of Mars. Lunar and Planetary Science XXXIX. 2441.pdf</ref>

In 2015, as ''[[New Horizons]]'' flew by the [[Pluto]]-[[Charon (moon)|Charon]] system, the spacecraft discovered a massive basin covered in a layer of nitrogen ice on Pluto. A large portion of the basin's surface is divided into irregular polygonal features separated by narrow troughs, interpreted as convection cells fueled by internal heat from Pluto's interior.<ref name = "Pluto updates"/><ref name="McKinnon2016"/> Glacial flows were also observed near Sputnik Planitia's margins, appearing to flow both into and out of the basin.<ref name="Umurhan2016"/>