First ALMA Millimeter-Wavelength SETI Survey Finds No Technosignatures but Reveals Stellar Bycatch of Over 6 Million Stars

To the point

Louisa Mason and colleagues used ALMA archival data to perform the first SETI survey at millimeter wavelengths, finding no technosignatures in two narrow windows but showing that high-frequency observations and the large number of stars in the field of view (over 6 million by the Besançon Galactic Model) offer a promising, data-rich path for future technosignature searches, a point highlighted with Michael Garrett, Andrew Siemion, and Kelvin Wandia at NAM 2026 in Birmingham.