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  • The Orbital Piloted Assembly and Experiment Complex is a proposed third-generation modular space station in Low Earth orbit. OPSEK would initially consist of modules from the Russian Orbital Segment of the International Space Station. The proposal would use OPSEK to assemble components of manned interplanetary spacecraft destined for Mars, the Moon, and possibly Saturn. The returning crew would also recover on the station before landing on Earth. This Russian space station could form part of a deep-space network, supporting manned exploration of the Solar system. Wikipedia