Beyond the Microwave Window: High-Frequency Archival Searches for Technosignatures with ALMA
To the point
Louise Mason of the University of Manchester says that scientists are widening SETI beyond the traditional radio band to high-frequency, narrowband signals using archival ALMA Band 3 data, Gaia astrometry, and the Besançon Milky Way model to survey thousands of stars for technosignatures, which could be deliberate transmissions, leaks, or relics from past civilizations.
