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:
“The novels are as useful as Bibles, if they teach you the secret, that the best of life is conversation, and the greatest success is confidence, or perfect understanding between sincere people.”
—Ralph Waldo Emerson (1803–1882)