NASA’s Curiosity rover has been crawling across the dusty, windswept plains of Mars, drilling into rocks and, in the process, revealing the Red Planet’s geological history. Now, it has stumbled upon its most compelling chemical clues yet: large organic molecules resembling fatty acids.

The NASA rover "Curiosity" discovered what scientists say is the largest ever seen organic molecules on Mars, raising speculation about if life was created billions of years ago on the Red Planet.

The discovery suggests prebiotic chemistry may have advanced further on Mars than previously observed. The analysis revealed the presence of decane, undecane, and dodecane.