Diversity-based biosignature could separate life from non-life in space data

Researchers report a May 2026 Nature Astronomy study from UC Riverside showing living systems produce amino-acids in a more diverse and evenly distributed pattern than non-living chemistry, using an ecology-inspired diversity measure (richness and evenness) tested on about 100 published datasets. The method—reading how evenly molecules are distributed rather than looking for specific molecules—also finds that fatty acids do reverse trends, so the signature isn't universal across molecule classes. Because the metric can run on standard abundance tables, it could be tested with measurements from current space missions, offering a low‑cost biosignature tool, though it remains preliminary: results are based on terrestrial data, not live missions, and real mission data will be needed to validate its usefulness and account for contamination and preservation effects.