Context

• Christina Koch, a US astronaut set a record for the longest single spaceflight by a woman, breaking the old mark of 288 days with about two months left in her mission.
• The US record for longest space flight is 340 days set by Scott Kelly in 2015-2016.
• The world record is 15 months set in the 1990s by a Russian cosmonaut aboard the former Mir space station.