Quite a bit of movie magic made "Alien" the sci-fi horror classic it is -- but one of its biggest challenges was solved with ...

Sputnik skies to analysis of interstellar visitors, scientists are rethinking how and where to look for physical traces of ...

Elon Musk has turned a long-running joke about being an extraterrestrial into a central part of his public persona, even as ...

SETI@home has been one of the largest citizen science projects ever, with millions of users around the world.