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:
“So long as the system of competition in the production and exchange of the means of life goes on, the degradation of the arts will go on; and if that system is to last for ever, then art is doomed, and will surely die; that is to say, civilization will die.”
—William Morris (1834–1896)