The Soviet Union launched Mir’s base block (core module), starting a new modular space station designed for long stays in orbit. Unlike earlier stations, Mir was built to grow by adding large laboratory modules to multiple docking ports.
Cosmonauts Leonid Kizim and Vladimir Solovyov launched on Soyuz T-15 and docked with Mir two days later. Their work turned the newly launched module into a functioning, crewed station and proved that the core module’s systems could support human life in orbit.
After completing their mission, the EO-1 crew returned to Earth and Mir was left unoccupied for a period. This gap highlights how early Mir operations still depended on launch schedules, spacecraft readiness, and funding priorities.
A new resident crew arrived, reestablishing continuous work aboard the station and preparing Mir for expansion. Regular crew rotation made it possible to maintain equipment, run experiments, and support the next stage: adding major modules.
The Kvant-1 astrophysics module docked to Mir as the first major add-on, marking the start of Mir’s planned growth. By bringing new instruments and systems, Kvant-1 expanded Mir beyond a single habitat into a research complex.
Because Kvant-1 did not fully seat during docking, cosmonauts performed an unplanned spacewalk to inspect the connection. They found debris preventing a proper seal, removed it, and enabled a complete docking—an early example of the hands-on maintenance Mir would often require.
A new long-duration expedition started, aimed at pushing human endurance in space and expanding routine station operations. Long stays were crucial for testing life-support reliability and understanding how the human body adapts to months in weightlessness.
After staying in orbit long enough to exceed the previous record by the required margin, Vladimir Titov and Musa Manarov were officially recognized as setting a new endurance record. The milestone strengthened Soviet claims that Mir could support very long missions with rotating crews and resupply.
After a period when Mir was left unoccupied, a new resident crew arrived on Soyuz TM-8. Resuming crewed operations helped stabilize the program and set the stage for another major expansion module.
The Kvant-2 module docked with Mir, bringing a dedicated airlock for spacewalks and improvements to life-support and onboard utilities. This made routine maintenance and external work safer and more efficient, supporting longer and more complex station operations.
Kristall arrived as a major laboratory module focused on materials processing and other experiments. It also supported future docking concepts (through specialized docking hardware), showing how Mir was being prepared for more varied spacecraft interactions.
Toyohiro Akiyama arrived at Mir as part of a mission backed by a Japanese broadcaster, reflecting new financial pressures and new partnerships near the end of the Soviet era. The flight showed how Mir operations were adapting by combining state goals with commercial and international participation.
The Soviet Union formally dissolved, ending the state that had built and operated Mir during its first years. Mir continued in orbit, but the program’s management, funding, and international relationships shifted as Russia became the primary successor for station operations.
Mir station assembly and Soviet-era operations (1986–1991)