Space & Astronomy
Oxygen Is the Exoplanet Biosignature Scientists Want Most—and the Hardest to Trust
Oxygen is a prime exoplanet biosignature candidate due to its link with photosynthesis on Earth, but abiotic processes can mimic its presence. Distinguishing life from non-life requires comprehensive analysis of the entire planetary environment, not just a single gas detection.
Dr. Alistair Finch·October 28, 2026
