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Discovery’s ‘bittersweet’ retirement isn’t the end for U.S. in space (VIDEO)

Discovery’s ‘bittersweet’ retirement isn’t the end for U.S. in space (VIDEO)

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Discovery’s ‘bittersweet’ retirement isn’t the end for U.S. in space (VIDEO)

Discovery’s ‘bittersweet’ retirement isn’t the end for U.S. in space (VIDEO)

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