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:
“When Learning’s Triumph o’er her barb’rous Foes
First rear’d the Stage, immortal Shakespear rose;
Each Change of many-colour’d Life he drew,
Exhausted Worlds, and then imagin’d new:”
—Samuel Johnson (1709–1784)