Live coverage: Falcon 9 rocket lifts off from California

A team of United Launch Alliance and NASA engineers worked through Delta 2 launch day fueling procedures during a simulated countdown Wednesday for what should be the second-to-last time before the venerable rocket’s final liftoff next month from California’s Central Coast.

An early test model of SpaceX’s Starship vehicle, which billionaire entrepreneur Elon Musk says will carry people and cargo to the moon and Mars, briefly left the ground on its first untethered test flight Thursday night powered by the company’s new methane-fueled Raptor engine.

NASA cited the complexity of Sierra Nevada’s Dream Chaser space plane and an uncertainty of when the proposed crew transport craft would be ready to fly astronauts to the International Space Station as the primary reasons the agency picked Boeing and SpaceX for lucrative contracts to develop commercial space taxis.