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:
“When in a serious mood, it seems to me that those people are illogical who feel an aversion toward death. As far as I can see, life consists exclusively of horrors, unpleasantnesses and banalities, now merging, now alternating.”
—Anton Pavlovich Chekhov (1860–1904)
“It is not part of a true culture to tame tigers, any more than it is to make sheep ferocious.”
—Henry David Thoreau (1817–1862)