From Viking to Perseverance: The Delicate, Decades-Long Hunt for Life Signatures Across Mars and Beyond
To the point
Sean McMahon and Frances Westall note that decades of searching for life signs—from Mars to exoplanets—yield hopeful yet uncertain clues, with Perseverance’s ancient redox hints possibly biological or geological and famous cases like Viking, Allan Hills 84001, Venus phosphine, and K2-18b underscoring the need for cautious, long‑term study.
