The space agency has retired its fleet of space shuttles and plans to turn much of its focus toward exploring deep into the solar system . U.S. companies are `` ready to step up to the plate , '' NASA chief says . The Dragon splashed down off Baja California on Sunday . Its return completes the first commercial space cargo mission . Score: 7
U.S. companies are `` ready to step up to the plate , '' NASA chief says . The Dragon splashed down off Baja California on Sunday . Its return completes the first commercial space cargo mission . Score: 7