NASA’s perseverance rover uncovers organic Carbon on Mars, offering new clues in search for ancient life

Using NASA's Perseverance rover, scientists are gaining a deeper understanding of organic carbon detected on Mars, offering new insights into whether Earth's planetary neighbor ever harbored life.

Using NASA’s Perseverance rover, scientists are gaining a deeper understanding of organic carbon detected on Mars, offering new insights into whether Earth’s planetary neighbor ever harbored life. The research, published in the journal Science Advances, describes the structure of organic carbon found last year in sedimentary rock that contained a potential biosignature a possible sign of past microbial life. The mudstone, formed between 3.2 and 3.8 billion years ago beneath a now-vanished body of water in Jezero Crater, has provided researchers with their first detailed look at macromolecular carbon in the region.

Organic carbon serves as the chemical backbone for molecules that build DNA, cells, and proteins, making it a key clue in the search for life. However, its presence alone is not proof of life, as it can also arise from nonbiological processes such as chemical interactions between water and rock. The detection of organic carbon in two rocks named Cheyava Falls and Walhalla Glades was disclosed last year when researchers announced the discovery of a potential biosignature in one of them. The rocks were sampled about 330 feet apart, according to planetary scientist Ashley Murphy, co-leader of the research.

Using Perseverance’s SHERLOC instrument, researchers analyzed the complex carbon present in the two rocks, finding that it bears similarities to carbon formed through both biotic and abiotic processes on Earth, as well as carbon found in meteorites. This marks the first instance of macromolecular carbon being discovered in mudstones in Jezero Crater, where Perseverance landed in 2021. NASA’s other rover, Curiosity, previously found similar carbon at Gale Crater, located about 2,300 miles away. “These findings indicate that the habitability of Mars and the availability of organic material have been widespread across the planet billions of years,” the researchers noted.

Mars, now cold and desolate, once possessed a thicker atmosphere and warmer climate, allowing for liquid water on its surface. Jezero Crater, which Perseverance has been exploring since 2021, was once flooded with water and home to an ancient lake basin, making it a prime location for studying potential microbial habitats. “The only place in the universe where we know life has emerged is Earth,” said Uckert. “If life is discovered on Mars, it could indicate that the emergence of life is not unique to our planet.” The findings bring scientists one step closer to answering one of humanity’s most profound questions Are we alone in the universe?