Astronaut Christina Koch spent a record-breaking 328 days in space

NASA astronaut Christina Koch made the most of her first trip to the International Space Station as she broke the record for the longest single spaceflight by a woman and conducting the first all-female spacewalk with fellow NASA astronaut Jessica Meir. Koch completed six spacewalks -- including another two with Meir -- and spent 42 hours and 15 minutes outside of the station. She will return to Earth on Thursday.