“An option for US astronaut Nick Hague to carry out a year-long flight to the ISS in 2019-2020 in being considered,” the source said. © NASA . NASA Satellite Discovers ‘Cool’ Neptune-Like Exoplanet According to the source, another less likely option is to send to that flight US astronaut Christina Koch, which, together with Ovchinin and Hague, will fly to the ISS in March on the Soyuz MS-12 spacecraft. READ MORE: NASA Fell Victim to Trump-Congress Feud — Russia’s Roscosmos Head The first flight to the ISS that lasted almost a year took place in 2015-2016 with the participation of Russian flight engineer Mikhail Kornienko and his US colleague Scott Kelly. Before this, Soviet and Russian cosmonauts made year-long flights to the Mir station: in 1987-1988 — Vladimir Titov and Musa Manarov, in 1998-1999 — Sergei Avdeyev. The longest single stay in space ever that lasted more than 14 months was performed by Valery Polyakov in 1994-1995 also at the Mir station.