"There's a reason we've never gone back to the moon," teases the poster for the new horror sci-fi flick "Apollo 18." The movie claims to reveal decades-old footage of astronauts on a secret mission two years after Apollo 17 -- the last real expedition to the moon -- flew in 1972. (Without giving away anything that isn't in the trailer, lunar aliens apparently share some blame for our 40-year absence from the moon.) In actuality, NASA did prepare for Apollos 18, 19 and 20.
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