Aliens might be transmitting communications signals to each other across exoplanets, some astronomers think. Since these signals are likely sent as narrowband radio waves, we may now have a way to ...

On a hot November day in the tropical forest of Arecibo, Puerto Rico, amongst the croaking of coquís, the message went out. Warbling audio crackled over loudspeakers—the audible result of the work of ...

If you’ve ever listened to a recording of whale song, you know that it can be haunting, beautiful, and moving. The songs of humpbacks and the clicks, called codas, of sperm whales are sophisticated ...

Astronomers are adopting new strategies in the search for extraterrestrial intelligence. A study in Monthly Notices of the Royal Astronomical Society suggests using Earth’s shadow to detect alien ...