Editing Titan (moon) (section)

=== Future conditions ===
Conditions on Titan could become far more [[Planetary habitability|habitable]] in the far future. Five billion years from now, as the Sun becomes a sub-[[red giant]], its surface temperature could rise enough for Titan to support liquid water on its surface, making it habitable.<ref>{{cite web |title=Climate Change in the Solar System |author=The National Air and Space Museum |date=2012 |url=https://blog.nasm.si.edu/2012/03/07/climate-change-in-the-solar-system/ |access-date=January 14, 2012 |url-status=dead |archive-url=https://web.archive.org/web/20120311101403/https://blog.nasm.si.edu/2012/03/07/climate-change-in-the-solar-system/ |archive-date=March 11, 2012 }}</ref> As the Sun's ultraviolet output decreases, the haze in Titan's upper atmosphere will be depleted, lessening the anti-greenhouse effect on the surface and enabling the greenhouse created by atmospheric methane to play a far greater role. These conditions together could create a habitable environment, and could persist for several hundred million years. This is proposed to have been sufficient time for simple life to spawn on Earth, though the higher [[viscosity]] of ammonia-water solutions coupled with low temperatures would cause chemical reactions to proceed more slowly on Titan.<ref>{{cite journal  |last1=Lorenz |first1=Ralph D. |last2=Lunine |first2=Jonathan I. |last3=McKay |first3=Christopher P. |title=Titan under a red giant sun: A new kind of "habitable" moon |journal=Geophysical Research Letters |date=1997 |volume=24 |issue=22 |pages=2905–8 |doi=10.1029/97gl52843 |pmid=11542268 |citeseerx=10.1.1.683.8827 |url=https://www.lpl.arizona.edu/~rlorenz/redgiant.pdf |access-date=March 21, 2008 |url-status=live |archive-url=https://web.archive.org/web/20110724173621/https://www.lpl.arizona.edu/~rlorenz/redgiant.pdf |archive-date=July 24, 2011 |bibcode=1997GeoRL..24.2905L |s2cid=14172341 }}</ref>