A strange purple object aboard the ISS sparked alien fears online, but NASA revealed it was a potato experiment. It shows how ...

A NASA astronaut recently sent the internet into a frenzy when he posted an alien-looking photo on social media. The photo ...

A retired 'UFO general' and a NASA-linked scientist have both vanished in the US, fuelling clashes over whether the case ...

A bizarre floating growth on the International Space Station has caused hilarious online comments.

As Trump orders UFO file release, scientists debate a deeper question—if aliens exist, what would they think of humanity?

Add Yahoo as a preferred source to see more of our stories on Google. A composite view of Mars taken by the Viking I and II probes. NASA/USGS In September, NASA announced the discovery of a possible ...

Did NASA discover city lights on an alien planet? This video explores the implications and details of the findings that ...

A photograph taken by a NASA astronaut has sparked fears it shows an extraterrestrial creature, but it’s just a photo of a potato.

Humans have wondered for centuries whether we are alone in the universe — and a new study suggests that if alien ...

Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. New ultraviolet ...

A former NASA developer has analyzed 1950 photographic plates showing nine unexplained objects in Earth's orbit, years before ...

What would alien life from another planet be like? But we rarely ask the opposite: What would they think of us?