The <a href="https://en.wikipedia.org/wiki/Soviet_Union" id="mwAR0" rel="mw:WikiLink" title="Soviet Union">Soviet Union</a> launches its <a href="https://en.wikipedia.org/wiki/Mir" id="mwAR4" rel="mw:WikiLink" title="Mir">Mir</a> spacecraft. Remaining in orbit for 15 years, it is occupied for ten of those years.