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

Could ancient alien technology be hiding on the Moon? Scientists propose searching lunar dust for microscopic traces of distant civilizations.

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 ...

Explore the Voyager golden records, messages sent into space containing images, sounds, and information about Earth, ...

Where are all the aliens? We've yet to find life outside of that on Earth, but that doesn't mean scientists aren't looking. In fact, the search for extraterrestrial intelligence is going strong, and ...

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 ...

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 ...

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 ...