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:
“Each reaching and aspiration is an instinct with which all nature consists and cöoperates, and therefore it is not in vain. But alas! each relaxing and desperation is an instinct too. To be active, well, happy, implies courage. To be ready to fight in a duel or a battle implies desperation, or that you hold your life cheap.”
—Henry David Thoreau (1817–1862)