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

Space station commander Chris Cassidy and Robert Behnken floated back outside Tuesday for their fourth spacewalk in less than a month, completing preparations for future upgrades including the eventual installation of an airlock that will allow commercial experiments to be moved into and out of vacuum as required.

An Orbital ATK Cygnus cargo craft departed the International Space Station on Wednesday, heading for a higher orbit to deploy 14 CubeSats and an eventual de-orbit burn to dispose of more than 6,200 pounds of trash and other unneeded equipment packed by the station’s crew.

NASA has agreed to allow its astronauts to fly on reused Crew Dragon spaceships and Falcon 9 boosters beginning as soon as SpaceX’s third launch of a crew to the International Space Station, a mission expected to launch next year.