NASA's 12 most far-out futuristic space projects - CNET - CNET
URL: https://www.cnet.com/pictures/nasa-innovative-advanced-concepts-mars-spacecraft-artificial-gravity/
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Submitted: Wed Apr 12 2017
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CT: UFOSeek News 2015: NASA's 12 most far-out futuristic space projects - CNET - CNET
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