Live coverage: International crew lands in Kazakhstan

A troublesome liquid oxygen valve on the Space Launch System’s first flight-rated core stage will keep NASA from performing a second test-firing of the rocket’s four main engines this week.

SpaceX’s upgraded Dragon capsules will not return astronauts to Earth for powered landings as originally envisioned, company boss Elon Musk said Wednesday, a design change that raises questions about the space transport firm’s plans to send commercial landers to the surface of Mars.

Commander Mike Hopkins and his three crewmates will board their Crew Dragon “Resilience” capsule Monday for a first-time maneuver to relocate the SpaceX-owned spaceship to a new docking port outside the International Space Station.