X-42 Pop-Up Upper Stage

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X-42 "Pop-Up Upper Stage" is the name of a US military space project that is still kept secret . Specifications or photos of the program have not yet been published and therefore not much is known about them. It is assumed that this is a multiple ignitable liquid-propelled rocket upper stage (hydrogen peroxide + JP jet fuel) that can carry a payload of 1,800 kg into earth orbit.

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US experimental aircraft

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