China’s space agency launched a classified spacecraft into orbit atop a Long March 2F rocket.

Not much is known about the specifics of the launch, but from what experts have gathered, the launch’s payload was most likely a reusable spaceplane. Whatever it was, it reached an altitude of 217 miles (350 km), deposited an unknown object into orbit, and then returned to what is most likely the Taklamakan Desert in China’s northwest.

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