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

Investigators believe a leak of propellant inside the Crew Dragon spacecraft’s propulsion system led to the capsule’s explosion April 20 during a ground test at Cape Canaveral, and a senior SpaceX official said Monday that delays are making it “increasingly difficult” to fly astronauts on the commercial spaceship before the end of the year.

Astronauts Christina Koch and Andrew Morgan floated outside the International Space Station Sunday and completed a 7-hour, 1-minute spacewalk to begin replacing batteries on the far left side of the research outpost’s solar array truss, the first of up to six excursions scheduled before the end of October.

These video replays show the liftoff of the Soyuz rocket carrying Oleg Kononenko, David Saint-Jacques and Anne McClain away from the Baikonur Cosmodrome in Kazakhstan, toward a rendezvous with the International Space Station around six hours later.