3I/ATLAS: Discovery of the Interstellar Comet, Its Coma Chemistry, and the Null Search for Technosignatures

To the point

3I/ATLAS is an interstellar comet discovered by ATLAS and studied for technosignatures by Sofia Sheikh with the Allen Telescope Array, who found no evidence of alien signals after filtering about 74 million candidates, while ALMA observations show unusually high methanol and frozen carbon dioxide suggesting formation in a much colder environment, and its high eccentricity confirms its interstellar origin, with any transmitter needing to emit roughly 10 to 110 watts to be detectable, guiding future technosignature searches.