Video: Soyuz MS-01 leaves the space station for landing

Space station flight engineer Jeff Williams will send commands Thursday to pump air into an experimental soft-sided module developed by commercial space habitat builder Bigelow Aerospace, expanding the structure to four times its current size in a stepping stone to future orbital destinations. Live video begins at 5:30 a.m. EDT (0930 GMT).

International Space Station commander Jeff Williams set a new U.S. space endurance record Wednesday, his 521st day in orbit over four missions, eclipsing the 520-day record set earlier this year by astronaut Scott Kelly at the end of his nearly one-year stay aboard the lab complex.

NASA has placed an order with Boeing for the first operational mission to ferry a crew to the International Space Station in a new era of commercial human spaceflight.