X-42 Pop-Up Upper Stage

X-42 is the designation of a still-classified U.S. military space project. Specifications or photos of the program have not been released to the public; as a result not much is known about its goals. It is believed to be a liquid-fueled rocket upper stage capable of boosting a payload of up to 4,000 lb (1,800 kg) into Earth orbit.

  • X-42, globalsecurity.org


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