BEIJING — Japan’s proposed H-X rocket program is moving ahead, with country’s space agency calling for a private company to develop, build and operate the family of space launchers. Mitsubishi Heavy Industries, prime contractor and operator of the current H-IIA and H-IIB launchers, is the only conceivable supplier for the H-X, which will presumably be given the permanent name H-III when full-scale development begins. In calling for a prime contractor for “our new flagship launch ...


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