Experts believe ancient alien civilizations have been living on mars. See more in this clip from Season 1, Episode 7, ...

Confirmation of alien life would answer one enormous question and immediately create dozens more. Humanity’s reaction would ...

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

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 ...

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 ...

The universe contains billions of potentially habitable worlds, yet humanity has found no confirmed sign of another ...

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 ...

The mathematical certainty that 'they' definitely exist in the universeWhen looking up at the night sky, everyone has surely ...

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

From the Star Wars spin-off The Mandalorian to the classic series Star Trek: The Next Generation, these are the best sci-fi shows that feature aliens.