Space research days in the space station, but this achievement was quickly overshadowed since the crew died on reentry to Earth. Salyut 1 was intentionally deorbited six months into orbit since it prematurely ran out of fuel. Skylab was the first American space station. It was 4 times larger than Salut 1. Skylab was launched in May 19, 1973. It rotated through three crews of three during its operational time. Skylab’s experiments confirmed coronal holes and were able to photograph eight solar flares. From 1986 to 2001, Russian space station Mir served as a permanent microgravity research laboratory in which crews conducted
International Space Station launched in November 2019, and other Russian modules which are planned to be attached to Nauka afterwards. Those modules would be within their useful lives in 2020 or 2024. The report presents a statement from an unnamed Russian engineer that, based on the experience from "Mir", a 30-year life should be possible, except for micrometeorite damage, because the Russian modules have been built with on-orbit refurbishment in mind. According to the Outer Space Treaty, the United States and Russia are legally responsible for all modules they have launched. In ISS planning, NASA examined options including returning the station to Earth