The findings, which were featured in a study that appeared in Nature, point to organic carbon and mineral structures that resemble processes often driven by life on Earth. The Case for Microbial Life on the Red PlanetAt the heart of the discovery are the fine-grained mudstones from which the samples were collected by Perseverance, which are rich in oxidized iron, phosphorus, sulfur, and most notably organic carbon. Organic carbon can form in several ways—one method is abiotic formation through sources like meteorites. Researchers emphasize that the evidence is not proof of past life, but it meets NASA’s criteria for “potential biosignatures” worthy of further investigation. Even more intriguing to the research team, at a site dubbed “Apollo Temple,” Perseverance succeeded in detecting an even stronger signal of organic carbon alongside the iron- and sulfur-bearing minerals.