Watch live as Elon Musk unveils his vision for missions to Mars

The mission will test a host of changes made to both the launch vehicle and the launch infrastructure as SpaceX prepares to support the Artemis 3 mission in 2027.

Officials will likely set a new launch date Thursday for a SpaceX-owned commercial cargo craft that was expected to take off Friday heading for the International Space Station, according to sources familiar with launch preparations.

Space station commander Chris Cassidy and Robert Behnken plan to float outside Friday for the first of up to four spacewalks needed to complete the replacement of aging batteries in the lab’s solar power system. NASA managers hope to get the work done in time for Behnken and crewmate Douglas Hurley to return to Earth aboard their Crew Dragon capsule by around Aug. 2, officials said Wednesday.