TKS flights proved that the FGBs could form the basis of such a space station module, with the TKS being flight ready, and having a considerable larger capacity than the Progress - so the FGB and not the Progress became the basis of many Soviet and Russian space station modules. The Gamma observatory, the initially intended first Progress-based research module, would become after these and other changes the free-flying Gamma satellite.

Design

The basic layout of the exemplary Zarya

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