Nasa astronaut Christina Koch has completed the longest-ever single spaceflight by a woman. The Russian Soyuz spacecraft carrying Koch parachuted down to the grasslands of Kazakhstan at around 09:12 GMT. She spent 328 days on the International Space Station (ISS), surpassing the previous record held by fellow American Peggy Whitson. Her stay is just 12 days short of the all-time US record set by Scott Kelly, who was on the ISS from 2015-2016. "I'm so overwhelmed and happy right now," she told reporters as she sat outside the capsule, shortly after it touched down in the snow. Ms Koch surpassed the 289-day record set by fellow American Ms Whitson on 28 December last year. But her return to Earth sets the marker for future space travellers to beat.