Astronomers have confirmed the presence of glycine—a fundamental amino acid essential for protein synthesis—in Venus's atmosphere. This marks the first detection of this molecule on a planet beyond Earth.
In mid-September, researchers announced the detection of phosphine high in Venus's atmosphere, where conditions mimic Earth's sea level. On our planet, phosphine is often linked to anaerobic bacteria, sparking global interest.
However, spotting phosphine's spectral signature doesn't confirm life. It could arise from exotic chemical processes instead.
Recent studies propose that phosphides from Venus's mantle might reach the surface via volcanism, then react with water or sulfuric acid in the atmosphere to produce phosphine.
Building on this, a team using the Atacama Large Millimeter/Submillimeter Array (ALMA) in Chile has identified glycine at mid-latitudes near Venus's equator. Among roughly 500 known amino acids, only 20 feature in Earth's genetic code—and glycine, the simplest, is one. While not a definitive biosignature, glycine is crucial for protein formation, a cornerstone of life.
This finding adds intrigue to Venus's potential habitability but isn't definitive proof. "On Earth, glycine arises biologically, but Venus might produce it via unique photochemical or geochemical pathways," caution researchers from Midnapore College's Department of Physics in India, who led the study.
Glycine has also appeared in comets and meteorites, lifeless environments.
The study awaits peer review. Challenges include glycine's spectral overlap with sulfur oxide and unverified results, similar to phosphine observations. Duplication is needed.
Could life thrive in Venus's clouds? A direct mission is ideal—and Rocket Lab is developing one.
