The federal government posted scores of never-before-seen files related to UFOs and UFO sightings on a new website. But the ...

And when people are convinced that they know a secret, world-shaking truth, they are willing to wait a long time for ...

Tiny life forms adrift in alien skies might one day expose themselves through the faintest play of light. A new study suggests that airborne microbes could leave detectable spectral fingerprints in ...

We have no idea what kind of life may exist on other planets, so it’s hard to know what to look for. Proxima Kósmos imagines a very different kind of solar system that could harbor life-forms we haven ...

Thomas Mulligan examines the scientific challenge of defining and searching for non-Earth-like alien life forms that may not ...

Neil deGrasse Tyson is an astrophysicist who is the director of the Hayden Planetarium at the American Museum of Natural ...