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:
“We swim, day by day, on a river of delusions, and are effectually amused with houses and towns in the air, of which the men about us are dupes. But life is a sincerity.”
—Ralph Waldo Emerson (1803–1882)