By isolating the same signal at various altitudes within the lower atmosphere, researchers identified the chemical's unique thermal fingerprint with a high degree of confidence, NASA said.
"This chemical is all around us in everyday life, strung together in long chains to form a plastic called polypropylene," said Conor Nixon, a scientist at NASA's Goddard Space Flight Center in Greenbelt, Maryland, and lead author of the paper.
"That plastic container at the grocery store with the recycling code 5 on the bottom - that's polypropylene."
The chemical is also used to make car bumpers and other consumer products.
The discovery could help scientists understand the "chemical zoo" that makes up Titan's hazy brownish atmosphere, said Scott Edgington, Cassini's deputy project scientist at NASA's Jet Propulsion Laboratory in Pasadena, California.
The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency.
(Reporting by Jane Sutton; Editing by Maureen Bavdek)
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