Video: Change of command aboard International Space Station

A NASA instrument built to help astronomers learn about the structure and behavior of neutron stars, super-dense stellar skeletons left behind by massive explosions, has been mounted to an observation post outside the International Space Station after delivery aboard a SpaceX supply ship earlier this month.

SpaceX raised a 215-foot-tall Falcon 9 rocket on pad 39A at NASA’s Kennedy Space Center in Florida this week, shortly after the launcher rolled out of the company’s hangar with a Crew Dragon spaceship to ferry four astronauts to the International Space Station.

Crew Dragon astronauts Douglas Hurley and Robert Behnken thanked their space station crewmates for a productive two-month visit, readied their SpaceX capsule for departure and stood by for a final “go” from flight controllers to undock Saturday night, setting up a Gulf of Mexico splashdown Sunday afternoon.