Original Plans For Nauka
In the 1990s, plans for the Russian segment of the ISS included several research modules that were intended to be adjunct to Zarya and Zvezda. However, the plans changed in the early 2000s. In August 2004, it was decided that Nauka would be built from the modified Khrunichev-built Functional Cargo Block (FGB-2), whose construction has been halted at 70-percent complete since the late 1990s. The FGB-2 was originally made as a backup for the original launch of the Zarya module (the first FGB), and as early as 1997 it was planned to be used as the Universal Docking Module (UDM).
There was an alternate, rejected proposal for Nauka from RKK Energia, based on the cancelled Commercial Enterprise Module, which was jointly funded by RKK Energia and SPACEHAB.
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