Q&A with Elon Musk, SpaceX’s founder and CEO

An Ariane 5 rocket emerged from the final assembly building at the Guiana Space Center in South America on Monday for the journey across the tropical spaceport to the ELA-3 launch zone, where the 179-foot-tall (54.8-meter) booster will lift off Tuesday with a pair of commercial communications satellites.

United Launch Alliance teams ran through an 11-hour countdown Friday at Cape Canaveral to rehearse procedures before the first flight of a modified Atlas 5 rocket with Boeing’s Starliner crew capsule Dec. 20.

Fresh from its inaugural test flight in space, Boeing’s first reusable Starliner crew capsule has been named “Calypso” by NASA astronaut Suni Williams, who will command the same vehicle on its next trip into orbit.