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:
“Only those who know the supremacy of the intellectual life ... can understand the grief of one who falls from that serene activity into the absorbing soul-wasting struggle with worldly annoyances.”
—George Eliot [Mary Ann (or Marian)