Editing Petroleum (section)

== Hydrocarbons on other worlds ==
On [[Saturn's]] largest moon, [[Titan (moon)|Titan]], lakes of liquid hydrocarbons comprising methane, ethane, propane and other constituents, occur naturally. Data collected by the space probe ''[[Cassini–Huygens]]'' yield an estimate that the visible lakes and seas of Titan contain about 300 times the volume of Earth's proven oil reserves.<ref name=oil>{{cite web|url=http://www.space.com/scienceastronomy/080213-titan-oil.html |title=Titan Has More Oil Than Earth |date=February 13, 2008 |website=Space.com |access-date=February 13, 2008}}</ref><ref>{{cite web|url=https://www.newscientist.com/article/dn24754-astrophile-titan-lake-has-more-liquid-fuel-than-earth/ |title=Astrophile: Titan lake has more liquid fuel than Earth |date=December 13, 2013 |work=New Scientist |first=Katia |last=Moskvitch |access-date=December 14, 2013}}</ref> Drilled samples from the surface of [[Mars]] taken in 2015 by the [[Curiosity Rover|''Curiosity'' rover's]] [[Mars Science Laboratory]] have found organic molecules of [[benzene]] and [[propane]] in 3-billion-year-old rock samples in [[Gale Crater]].<ref name=nyt20180607>{{cite news |url=https://www.nytimes.com/2018/06/07/science/mars-nasa-life.html |title=Life on Mars? Rover's Latest Discovery Puts It 'On the Table' |first=Kenneth |last=Chang |date= June 7, 2018 |work=[[The New York Times]] |quote=The identification of organic molecules in rocks on the red planet does not necessarily point to life there, past or present, but does indicate that some of the building blocks were present. }}</ref>