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:
“My life is superficial, takes no root in the deep world; I ask, When shall I die, and be relieved of the responsibility of seeing a Universe which I do not use? I wish to exchange this flash-of-lightning faith for continuous daylight, this fever-glow for a benign climate.”
—Ralph Waldo Emerson (1803–1882)