The Cassini spacecraft found small amounts of propylene, a chemical used to make storage containers and other products, in the atmosphere of Titan, Saturn’s largest moon. Titan is among the few bodies in the solar system with a significant atmosphere made up of hydrocarbons.
This undated photo shows Saturn's moon, Titan, in ultraviolet and infrared wavelengths. The Cassini spacecraft took the image while on its mission to gather information on Saturn, its rings, atmosphere and moons. The different colors represent various atmospheric content on Titan. /NASA via Getty Images Buy Photo