In popular cultures, "Extraterrestrials" are life forms — especially intelligent life forms— that are of extraterrestrial origin (often also called "aliens").
Famous quotes containing the word life:
“I’ll bet your father spent the first year of your life throwing rocks at the stork.”
—Irving Brecher, U.S. screenwriter, and Edward Buzzell. J. Cheever Loophole (Groucho Marx)