A UFO hovers over three figures on the street. Aliens could, in theory, reach Earth but would never truly go home again, according to physicists who say Einstein's laws of relativity turn any ...

Who remembers Robin Williams yelling “Shazbot!” — the all-purpose, TV-friendly alien curse word that lent Mork & Mindy part of its quirky sci-fi charm? As a genre, science fiction has a built-in ...