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:
“It is not enough that our life is an easy one. We must live on the stretch, retiring to our rest like soldiers on the eve of a battle, looking forward to the strenuous sortie of the morrow.”
—Henry David Thoreau (1817–1862)