An international team of astrobiologists claim that organic molecules discovered by NASA’s Curiosity Mars rover could be evidence of life on Mars.

In a paper published in the journal Astrobiology, the team argues that the presence of “thiophenes,” which are special compounds found in coal, crude oil and white truffles back on Earth, could be a sign of ancient life on the Red Planet.

“We identified several biological pathways for thiophenes that seem more likely than chemical ones, but we still need proof,” Washington State University astrobiologist and lead author Dirk Schulze-Makuch said in a statement.

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