The night sky is, and always has been, safe and free.
Scientists have measured the shortest unit of time ever, the time it takes for a particle of light to cross a hydrogen molecule.
SpaceX, Astrobotic and a dozen other companies just got an infusion of NASA cash to develop potentially game-changing exploration technologies.
As humanity ramps up its search for alien life, we should keep in mind that E.T. might be hunting for us as well.
Two dozen alien worlds may be as good as or better than Earth for life as we know it, a new study finds.
Algol, also known as the Demon Star, is quite possibly the most interesting star in the fall and winter skies, if you know when to look for its brightness changes.
Skywatchers will be treated to an eye-catching gathering in the south-southwest sky about an hour after sunset on Thursday (Oct. 22) — a large triangle formed by the moon, Jupiter and Saturn.