Astronomers swept millions of candidates and found no alien signals from K2-18b, setting the first power limit on any transmitter there.

Radio silence has long puzzled those searching for extraterrestrial intelligence, but the answer might lie much closer to the source of potential signals than previously thought. Conditions around other stars could be scrambling even intentionally narrow ...

Radio astronomers have decoded a peculiar repeating radio signal from deep space, tracing it to a vampiric binary star system.

Scientists hunting for radio signals from any form of advanced extraterrestrial life that might be out there trying to contact us are now starting to wonder if something has been messing with their work. A new study published by researchers at the SETI ...

For decades, humanity has scoured the cosmos for any signs that we aren't alone in the universe. NASA spacecraft like the twin Voyager probes – launched in the 1970s bearing the iconic Golden Record – exoplanet-hunting missions and ground telescopes ...