Stellar Weather Hides Alien Signals

Researchers at the SETI Institute modeled how plasma turbulence and stellar activity near a transmitting planet can broaden an originally ultra‑narrow radio signal, spreading its power across frequencies so it slips below narrowband detection thresholds. They built a practical framework by calibrating against spacecraft transmissions in our solar system and extrapolating to other stellar types, finding M‑dwarf systems are particularly likely to wash out narrowband technosignals. — If true, the result implies many past null results are observational artifacts and that SETI search strategies and resource allocation should be revised to account for stellar environment effects.