Live coverage: SpaceX supply ship returns to Earth

Astronaut Scott Kelly, 143 days into a planned 341-day stay aboard the International Space Station, urged lawmakers Monday to restore full funding to NASA’s commercial crew program to avoid expected launch delays and continued sole reliance on Russia for transportation to and from the International Space Station.

The development mission includes fewer additional mission milestones compared to the third flight with a focus on demonstrating the reusability model that Starship promises. Liftoff happened at 7:50 a.m. CDT (8:50 a.m. EDT, 1250 UTC), near the opening of a 120-minute window.

The next test of a critical safety system on SpaceX’s human-rated Dragon spaceship will be delayed, likely until some time next year, as the company adjusts the development schedule for the new commercial crew capsule designed to take astronauts to the International Space Station.