Editing Greenhouse effect (section)

===Titan===
[[Saturn]]'s moon [[Titan (moon)|Titan]] has both a greenhouse effect and an [[anti-greenhouse effect]]. The presence of nitrogen ([[Dinitrogen|N<sub>2</sub>]]), methane ([[CH4|CH<sub>4</sub>]]), and hydrogen ([[Hydrogen|H<sub>2</sub>]]) in the atmosphere contribute to a greenhouse effect, increasing the surface temperature by {{convert|21|K-change}} over the expected temperature of the body without these gases.<ref name="McKay1991" /><ref name="astrobio2005">{{Cite web |date=3 November 2005 |title=Titan: Greenhouse and Anti-greenhouse |url=https://www.astrobio.net/retrospections/titan-greenhouse-and-anti-greenhouse/ |url-status=usurped |archive-url=https://web.archive.org/web/20190927031140/https://www.astrobio.net/retrospections/titan-greenhouse-and-anti-greenhouse/ |archive-date=27 September 2019 |access-date=4 November 2019 |website=Astrobiology Magazine |language=en-US}}</ref>

While the gases N<sub>2</sub> and H<sub>2</sub> ordinarily do not absorb infrared radiation, these gases absorb thermal radiation on Titan due to pressure-induced collisions, the large mass and thickness of the atmosphere, and the long wavelengths of the thermal radiation from the cold surface.<ref name="Pierrehumbert2011" /><ref name="McKay1991" /><ref name="astrobio2005" />

The existence of a high-altitude haze, which absorbs wavelengths of solar radiation but is transparent to infrared, contribute to an anti-greenhouse effect of approximately {{convert|9|K-change}}.<ref name="McKay1991" /><ref name="astrobio2005" />

The net result of these two effects is a warming of 21 K − 9 K = {{convert|12|K-change}}, so Titan's surface temperature of {{convert|94|K|C F|0|abbr=on}} is 12 K warmer than it would be if there were no atmosphere.<ref name="McKay1991" /><ref name="astrobio2005" />