- Associated Press - Friday, February 13, 2015

Astronomers are debating whether it would be a good idea to send signals into the universe, looking for extra-terrestrial life. Since we don’t know who might respond, some argue we’d be asking for cosmic trouble. Such is the dilemma often wrestled with in science-fiction movies, where aliens sometimes come in peace - and often do not:

Good alien: E.T. Cute, finger-glowing creature who likes Reese’s Pieces. Just wants to phone home.

Bad alien: The creatures of “Alien.” Lizard-like with daggers for teeth. With a propensity for protruding from stomachs, they will kill your appetite, too.

Good alien: Yoda. Wise, long-eared Jedi master. Only a threat to the Dark Side or to the syntactically sensitive, he is.

Bad alien: Predator. Ugly, lethal hunters with thermal vision who prey on action stars and return again and again in increasingly questionable installments.

Good alien: The blue Na’vi of “Avatar.” Tall, lithe and wondrous creatures, though blurry without 3-D glasses.

Bad alien: The invaders of “Independence Day.” Exploders of the world’s metropolises, yet susceptible to chest-thumping patriotism, Will Smith.

Good alien: David Bowie in “The Man Who Fell to Earth.” A pale, red-haired lover of women and alcohol. He still lives among us.

Bad alien: The spindly machines of “War of Worlds.” Human-vaporizing intruders who will turn Earth red and inspire dubious radio broadcasts.

Good alien: Superman. The ultimate space messiah. Questionable fashion sense, though.

Bad alien: The Bodysnatchers. They came to consume us and steal our precious resources, like Donald Sutherland.

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