High Quality Content by WIKIPEDIA articles! Mir (Russian: Мир, IPA: ; lit. Peace or World) was a Soviet and later Russian space station, operational in low Earth orbit from 1986 to 2001. With a mass greater than that of any previous space station, Mir was constructed from 1986 to 1996 with a modular design, the first to be assembled in this way. The station was the largest artificial satellite orbiting the Earth until its deorbit on 21 March 2001, a record now surpassed by the International Space Station (ISS). Mir served as a microgravity research laboratory in which crews conducted experiments in biology, human biology, physics, astronomy, meteorology and spacecraft systems in order to develop technologies required for the permanent occupation of space.