A radio signal has been detected from comet 3I/Atlas, with some reports indicating it is the first such signal to be emitted by the comet. The signal is attributed to absorption by hydroxyl radicals, or OH molecules, rather than any extraterrestrial origin. The discovery has been studied by astronomers and scientists, including those involved in the search for extraterrestrial intelligence (SETI), who have released their findings on the nature of the signal.