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:
“And whether life had been before that sleep
The Heaven which I imagine, or a Hell
‘Like this harsh world in which I wake to weep,
I know not.”
—Percy Bysshe Shelley (1792–1822)