TOKYO -- Japanese spaceflight startup PD Aerospace plans to test an unmanned space plane with the goal of achieving manned spaceflights by 2023. The Nagoya-based company said it will speed up development of unmanned suborbital space planes, with test flights set for 2019.
PD Aerospace eventually hopes to offer thrill-seekers five-minute flights at zero gravity, during which the space plane will ascend to an altitude of 100km.
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