Universal Docking Module

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The Universal Docking Module (UDM) was a planned Russian component for the International Space Station, to be jointly built by RKK Energia and Khrunichev. The original design would have it docked to the nadir (Earth-facing) ISS Zvezda service module docking port, and have four docking ports to accommodate the Russian Research Modules and SO2 Docking Compartment. The SO2, and one Research Module have since been cancelled due to lack of funds. Furthermore, original design of the UDM has been cancelled and replaced with the Multipurpose Laboratory Module. It should be noted that the name "Universal Docking Module" still appears on the current NASA and ESA websites.

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