Add Yahoo as a preferred source to see more of our stories on Google. UPDATED: There's a massive gravitational wave announcement on the way Too much cosmic radiation can sterilize a planet – but a ...

Cosmic rays are particles from outer space that travel across the universe. They can be made by the sun, by other stars exploding, and even black holes. They move extremely fast, nearly the speed of ...

SALT LAKE CITY — The first thing to know about potential alien invaders is that the U.S. Government no longer classifies them as unidentified flying objects. That sounds too scary. They are classified ...