NASA has requested two more private International Space Station missions.

NASA will sponsor two private low-Earth-orbit missions.

NASA and the global ISS consortium want to expand commercial research on 

the orbiting complex with two further voyages between 2023 and 2024.

The organisation plans to operate the orbital complex until 2030

NASA offered early-stage funding for commercial space stations late last year.

Specific dates will be provided after the spacecraft docking schedule and in-orbit activities are confirmed

NASA said the missions must be arranged by a U.S. organisation and employ an American spacecraft.

NASA only authorises SpaceX for astronaut orbital flights

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