Origins
The basic structural frame of Zvezda, known as "DOS-8", was initially built in the mid-1980s to be the core of the Mir-2 space station. This means that Zvezda is similar in layout to the core module (DOS-7) of the Mir space station. It was in fact labeled as "Mir-2" for quite some time in the factory. Its design lineage thus extends back to the original Salyut stations. The space frame was completed in February 1985 and major internal equipment was installed by October 1986.
The MIR-2 space station was redesigned after the failure of the Polyus core module to reach orbit. Zvezda is around 1/4 the size of Polyus, and has no armaments.
Read more about this topic: Zvezda (ISS Module)
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