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NASA’s Curiosity rover has detected hydrocarbon chains — the longest ever found on Mars — in a 3.7-billion-year-old rock sample from a dried lakebed named Yellowknife Bay. ... Earlier findings ...

Curiosity discovered three long-chain hydrocarbon molecules in a sample on Mars, containing 10, 11, and 12 carbon atoms. Credit: NASA/Dan Gallagher.

Fatty acids are long, linear hydrocarbon molecules with a carboxyl group (COOH) at one end and a methyl group (CH3) at the other, forming a chain of carbon and hydrogen atoms.

Fatty acids are long, linear hydrocarbon molecules with a carboxyl group (COOH) at one end and a methyl group (CH3) at the other, forming a chain of carbon and hydrogen atoms.

These are long-chain hydrocarbons found in life-relevant amino acids here on Earth. Freissinet and her colleagues think these substances may have broken off from larger molecules during the SAM ...

“SAM is a mini chemical laboratory on Mars, which can heat up a sample up to 850 °C, separate the molecules released from it, and identify them one by one,” Freissinet said in an email. “The analysis ...