In popular cultures, "Extraterrestrials" are life forms — especially intelligent life forms— that are of extraterrestrial origin (often also called "aliens").
Famous quotes containing the words life and/or culture:
“O! the one Life within us and abroad,”
—Samuel Taylor Coleridge (1772–1834)
“The time will come when the evil forms we have known can no more be organized. Man’s culture can spare nothing, wants all material. He is to convert all impediments into instruments, all enemies into power.”
—Ralph Waldo Emerson (1803–1882)