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

The aliens were next door, and somebody killed them. That’s the story plasma physicist John Brandenburg, PhD, tells about Mars. His theory suggests that a civilization built monuments on our ...

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

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

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 ...

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

Is intelligent alien life really out there? With powerful telescopes identifying more potentially habitable planets each year ...

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 ...

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

For decades, SETI researchers have focused on finding narrow-band radio signals that might stand out from the natural universe. But what if an advanced civilization that wanted to communicate would ...

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 ...