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LIFE.com: Sexiest Women of Science Fiction

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Ellen Ripley: Tougher Than the Aliens

Sigourney Weaver's no-nonsense alien-busting mineral refiner-turned-action hero not only kicked serious xenomorph ass, she also won our hearts whether she was in a bulky spacesuit, wielding a flamethrower, or hopping around in her skivvies. Thanks to bryant52 for ensuring the game isn't over, man. (Hulton Archive/Getty Images/LIFE.com)
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