Europa may be one of the most promising places to search for alien life, but it is also one of the hardest moons to explore.

Scientists suggest the Moon could act as a quarantine checkpoint before samples from Mars are brought back to Earth.

Forget Hollywood: aliens should look as different to us as we do to bananas, saysdeGrasse Tyson ...

Thousands of people have reported UFOs or alien encounters in Northern California. That number could soon go up.

A Soviet astronomer in the 1960s proposed a scale to classify hypothetical alien civilizations. Here’s why the framework is ...