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Submission + - The four greatest spaceships that never were (

nasor writes: Hubpages has an interesting writeup on the four greatest spaceships that were seriously worked on, but never built. The list includes Sea Dragon, a massive sea-launched rocket that could launch the entire mass of the ISS into orbit at once, the U.S. Air Force's failed X-20 space fighter, NASA's ill-fated VentureStar single-stage-to-orbit shuttle, and the Soviet Buran shuttle that managed a single unmanned orbital flight while only partly completed before being crushed by its own hanger.

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