In May 1986, Leonid Kizim and Vladimir Solovyov left the newly opened Mir, crossed 2,500 kilometres to Salyut 7, and returned carrying 350 to 400 kilograms of instruments — the only human voyage ever made from one space station to another
On 5 May 1986, Leonid Kizim and Vladimir Solovyov sealed the hatch of the newest space station in…