Space fans hoping that the intruder from beyond the solar system known as Comet 3I/ATLAS is actually an alien spacecraft may be disappointed by new research that could close the book on this speculation once and for all.
Astronomers used the Green Bank Telescope, employed in the Breakthrough Listen extraterrestrial signal-hunting astronomy project, to search 3I/ATLAS for measurable signs of technology from extraterrestrial civilizations, or "technosignatures."
