The Russian Space Station Mir
Once completed, Mir had a mass of more than 100 tons. It consists of seven modules launched separately and brought together in space over a period of 10 years. Experience gained by Russia during Mir assembly and by both countries during Phase 1 provided valuable experience for the eventual International Space Station assembly. Mir has been in orbit for over 10 years, and staffed continuously for the past seven years. The complex presently consists of the Mir core and the Kvant, Kvant 2, Kristall, Spektr, and Docking Modules. Mir measures more than 107 feet long with docked Progress-M and Soyuz-TM spacecraft, and is about 90 feet wide across its modules. See the diagram below to get a better idea of how Mir is put together.