A new study proposes searching the moon for remnants of ancient extraterrestrial technology. Researchers suggest the moon's surface could preserve microscopic "technosignatures" left by alien ...

Intelligent alien life has remained elusive despite decades of searching the skies, but new technologies and ideas are ...

Suppose an alien civilization discovers Earth and decides to investigate. Before it chooses a landing site or considers how ...

In 1964, Soviet astronomer Nikolai Kardashev introduced a revolutionary system for classifying civilizations by their ability ...

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 ...

Add Yahoo as a preferred source to see more of our stories on Google. Distance, light speed, biology, and time may explain why alien civilizations never meet. (CREDIT: Wikimedia / CC BY-SA 4.0) "There ...

Claims that aliens are already here are everywhere, but proving them is another matter. The strongest cases become more ...

John Brandenburg—a plasma physicist at an aerospace development company—argues that there was an alien civilization on Mars. He cites data from NASA’s Curiosity rover, claiming that xenon levels on ...

Searching for extraterrestrial intelligence has so far primarily meant focusing on one particular type of signal—and that signal has normally been based on our own current cutting-edge technology. But ...

In the coming month, humans are going to experience their first encounter with an alien civilization as predicted by blind ...

Elon Musk’s plans for the future of SpaceX, and humanity, are rooted in an idea conceived in the 1960s when astronomers began to pick up mysterious, unknown radio sources in the cosmos. Soviet ...