Science Fiction magazine art gallery from LIFE

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This week, physicist Stephen Hawking warned that we should avoid contact with extraterrestrials as long as possible, or risk their wrath. To bring that point home, our friend Ben Cosgrove at LIFE published a big gallery of creepy-fun science fiction cover art from the golden age of SF magazines in the 1940s and 1950s. "Fantasy & Sci-Fi Magazine Art"