A retired 'UFO general' and a NASA-linked scientist have both vanished in the US, fuelling clashes over whether the case points to espionage, a cover-up or something stranger.

A former NASA developer has analyzed 1950 photographic plates showing nine unexplained objects in Earth's orbit, years before the first satellite launch, sparking alien technology theories ...

When it comes to the space sciences, nothing is quite as exciting as the search for alien life, and NASA thinks it has a good idea of where to look.

Aliens: "Sorry, you're cutting out!" The post Something May Be Scrambling Alien Messages, NASA-Funded Research Finds appeared ...

The spud's alien-like root growth has prompted some conspiracy theories.

Photographic plates captured in the early 1950s appear to show evidence of at least one artificial object orbiting the Earth years before the first successful space launch ...

Evidence of alien life or cosmic pyramid scheme? A documentary filmmaker sparked a discussion of advanced Martian ...

Answers to some of those questions could finally become public after President Trump's call last week for the release of files related to UFOs or any "alien and extraterrestrial life." Mr. Trump ...

If aliens are out there, why haven’t we heard from them? That’s the question at the center of Pop Mech’s new story, “Aliens Probably Exist—But They’re Staying Silent For a Reason, NASA Scientist ...

Space conspiracy theorists are accusing NASA of cutting a live stream from the International Space Station just as an unidentified object comes into view. Theories began swirling on YouTube earlier ...

The images that recently have gone viral actually date back to 2001.

Despite the universe's vastness, containing billions of stars and galaxies, humanity has yet to encounter alien life. Scientists are actively searching for habitable planets and signs of life, but the ...