Shuttle Atlantis unwrapped ahead of public debut

SpaceX’s first upgraded Cargo Dragon spaceship departed the International Space Station Tuesday morning with more than 4,400 pounds of research specimens and other equipment, heading for splashdown Wednesday night in the Gulf of Mexico off the west coast of Florida.

Seven astronauts and cosmonauts are gearing up for launches April 9 and April 22 to the International Space Station, replacing seven outgoing crew members set to land in Kazakhstan and off the coast of Florida on April 17 and April 28.

SpaceX moved closer to its next launch with a successful hold-down engine firing Saturday at the Kennedy Space Center in Florida, sailing through a readiness check for a planned liftoff Wednesday with a clandestine U.S. government payload named Zuma.