Enlarge / There will be a lot of pizza nights for Christina Koch, NASA's newest extended-stay astronaut. (credit: NASA) On Wednesday morning, NASA announced that Christina Koch, who is already living on board the International Space Station, will extend her mission to 328 days. By doing so, she will become the space agency's second astronaut to spend nearly a year inside the orbiting laboratory. "It feels awesome," Koch said in a video interview from the station.