Study finds peptides maintain structure in Venus-like acidic conditions

Scientists have reported new evidence that complex biological molecules might survive in the acidic clouds of Venus, challenging long‑standing assumptions about the planet’s hostile atmosphere. The study, published in *Nature Astronomy*, used spectroscopic data from the Venus Express orbiter and laboratory simulations to identify signatures of amino‑acid precursors in the planet’s cloud layers, which are dominated by sulfuric acid droplets and temperatures around 70 °C.

The researchers compared the spectral fingerprints of known organic compounds with the cloud‑layer measurements, finding matches that suggest a stable chemical environment capable of supporting prebiotic chemistry. While the acidic conditions would normally degrade organic matter, the team proposes that the droplets could act as protective micro‑environments, shielding molecules from ultraviolet radiation and high temperatures. This finding aligns with recent detections of phosphine and other potential biosignatures in Venusian clouds, adding a new dimension to the search for life beyond Earth.

If confirmed, the presence of complex organics in Venus’s clouds could redefine the criteria for habitable environments and inform future missions aimed at probing the planet’s upper atmosphere. The research team plans to collaborate with upcoming Venus missions to conduct in‑situ analyses and further test the stability of these molecules under Venusian conditions.