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:
“While you here do snoring lie,
Open-eyed conspiracy
His time doth take.
If of life you keep a care,
Shake off slumber, and beware.
Awake, Awake!”
—William Shakespeare (1564–1616)