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 have not read of any Arcadian life which surpasses the actual luxury and serenity of these New England dwellings. For the outward gilding, at least, the age is golden enough.”
—Henry David Thoreau (1817–1862)