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That strategy begins with fully utilizing the International Space Station, then aims to expand humanity's presence across the solar system over the next 25 years, leading ultimately to manned missions to Mars, project officials said. [Visions of the Future of Human Spaceflight]
The Universal Docking Module (UDM) (Russian: Универсальный стыковочный модуль) was a planned Russian docking module for the International Space Station, to be jointly built by RKK Energia and Khrunichev. The original design resembled the Functional Cargo Block albeit larger, and would have it docked to the nadir (Earth-facing) Zvezda service module docking port, and have four docking ports to accommodate the two Russian Research Modules and the SO2 docking compartment. Because the SO2 and a Research Module were cancelled due to lack of funds, this module was also cancelled. The one remaining Research Module was then scheduled to be fitted to the open docking port on Zvezda. Later it was also cancelled and that port was allocated to the Docking Cargo Module. DCM scheduled location was later moved to Zarya.
Therefore, by 2015 the ISS RS will include 8 modules: FGB Zarya, SM Zvezda, MLM, MRM-1-CDM, MRM-2-DC2, NM, SPM-1 and SPM-2. The RS total mass would be 122 tonnes, the pressurized volume up to 400 m³, and a power capacity of 80 kW.