The first unmistakable signal from another intelligence would rank alongside fire and writing in the story of our species, yet a growing group of researchers warns that such a moment might arrive not ...

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 ...

Historically, many scientists and society have been fascinated by the prospect of making contact with extraterrestrial ...

Scientists suggest the first alien signal we detect could be a desperate cry for help from a fading civilization.

A legendary signal from deep space, once dismissed by some as statistical noise, has just become even more mysterious.

On Dec. 18, just 24 hours before its closest approach, the Green Bank Telescope scanned frequencies from 1 to 12 GHz. Their ...

The search for extraterrestrial intelligence (SETI) has yet to detect alien technosignatures like radio waves, but the cosmos is vast, and there are plenty of places left to look. New research ...

A recent NASA-backed study suggests that alien civilizations could potentially detect some of the signals humans send into space. Researchers from Pennsylvania State University and NASA's Jet ...

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On August 15, 1977, the Big Ear Radio Telescope in Delaware, Ohio, received the most powerful signal it would ever detect during its decades of observations. The signal lasted just 72 seconds, but ...