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What is Sigourney Weaver famous for?

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The Editors of Encyclopaedia Britannica
Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree....
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Sigourney Weaver is an American actress known for portraying strong, independent women onscreen. She catapulted to fame with her performance as Ellen Ripley in Ridley Scott’s Alien (1979) and subsequent sequels. She also played a supporting role in the original Ghostbusters movies and has appaeared in James Cameron’s Avatar franchise.