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:
“For the salvation of his soul the Muslim digs a well. It would be a fine thing if each of us were to leave behind a school, or a well, or something of the sort, so that life would not pass by and retreat into eternity without a trace.”
—Anton Pavlovich Chekhov (1860–1904)