Zvezda (ISS module)
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| Station statistics | |
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| Launch date: | July 12, 2000 |
| Launch vehicle: | Proton-K |
| Docked: | July 26, 2000 |
| Undocked: | Permanently Docked |
| Reentry: | TNB |
| Mass: | 20,320 kilograms (44,800 lb) |
| Length: | 13.1 metres (43 ft) |
| Width: | 29.7 metres (97 ft) |
| Diameter: | 4.35 m |
| References: | |
| Configuration | |
 On-orbit configuration of the Zvezda service module
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Zvezda (Russian: Звезда́, meaning "star"), DOS-8, also known as the Zvezda Service Module, is a component of the International Space Station (ISS). It was the third module launched to the station, and provides all of the station's life support systems, some of which are supplemented in the USOS, as well as living quarters for two crew members. It is the structural and functional center of the Russian portion of the station - the Russian Orbital Segment.
The module was manufactured by RKK Energia, with major sub-contracting work by GKNPTs Khrunichev.Zvezda was launched on a Proton rocket on July 12, 2000 and docked with the Zarya module on July 26.
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 orbital weapons platform core module to reach orbit. Zvezda is around 1/4 the size of Polyus, and has no armaments.
Zvezda consists of the cylindrical "Work Compartment" where the crews work and live (and which makes up the bulk of the modules volume), the small spherical "Transfer Compartment" located at the front (with three docking ports), and at the aft end the cylindrical "Transfer Chamber" (with one docking port) which is surrounded by the unpressurized "Assembly Compartment" – this gives Zvezda four docking ports in total. The component weighs about 18,051 kg (39,796 lb) and had a length of 13.1 metres (43 ft). The solar panels extend 29.7 metres (97 ft).
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