Humans have wondered about life beyond our planet since ancient times, and researchers have worked hard for decades to find ...

The search for extraterrestrial intelligence (SETI) is mostly concerned with where to look for technosignatures from another ...

Complex, intelligent life in the galaxy appears vanishingly rare, with the nearest possible civilization perhaps 33,000 light-years distant. Yet despite the odds, scientists insist that continuing the ...

Are humans alone in the universe, or could intelligent alien civilizations exist somewhere beyond Earth? For more than 60 ...

AI agents now help SETI Institute and Breakthrough Listen to operate radio telescopes and sift through space signals in real time, even before an observation ends.

For decades, science fiction writers have tried their best to prepare us for eventual contact with aliens. Their efforts are dominated by several recurrent tropes. There's the invasion by a warlike ...

Scientists searching for advanced alien civilizations have detected a mysterious signal in data from the world's largest single-dish radio telescope.

Suppose an alien civilization discovers Earth and decides to investigate. Before it chooses a landing site or considers how to introduce itself, it faces a less dramatic question: how much mass should ...

What if aliens were building a massive power plant?Last time, I talked about the "Kardashev scale," which classifies the ...

In 1950, famed astrophysicist Enrico Fermi posed a profound question during a casual lunch with colleagues: Where is everybody? In other words, if there’s an extremely high probability that advanced ...