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JoeMerchant [soylentnews.org] writes:

NASA's Perseverance rover has made its most robust discovery yet by detecting complex macromolecular organic carbon sitting directly on the natural rock surfaces of Mars. According to a newly published study in Science Advances [science.org], the rover's SHERLOC ultraviolet laser spectrometer mapped hundreds of organic signatures within 3.5-billion-year-old mudstones at the "Bright Angel" outcrop inside Jezero crater.

Reporters at Space.com [space.com] note that this marks the first time intact macromolecular carbon has been found completely exposed on an unprepared martian rock surface, suggesting these compounds are either surprisingly resistant to radiation or were very recently uncovered by wind erosion. While scientists emphasize that these organic molecules can form through both biological and geological processes, Science News [sciencenews.org] reports that the find significantly expands our understanding of martian habitability.

Crucially, as highlighted by The Guardian [theguardian.com], this discovery means rovers have now found organic-bearing mudstones more than 2,000 miles apart on the planet, adding to the Curiosity rover's earlier findings at Gale crater. Experts writing for Eos.org [eos.org] state that the widespread nature of these ingredients indicates ancient Mars may have routinely possessed the conditions necessary for microbial life.

As covered by Interesting Engineering [interestingengineering.com], the discovery includes data from the infamous "Cheyava Falls" rock, which previously made headlines for its intriguing "leopard spots." Ultimately, confirming whether these structures are biological or purely geochemical will require analyzing the cached samples in highly sensitive laboratories back on Earth, making a compelling case for a future Mars Sample Return mission.

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