(AP) — For the second month in a row, the aerospace upstart SpaceX landed a rocket on an ocean platform early Friday, this time following the successful launch of a Japanese communications satellite. A live web broadcast showed the first-stage booster touching down vertically in the pre-dawn darkness atop a barge in the Atlantic, just off the Florida coast. Because of the high altitude needed for this mission, SpaceX did not expect a successful landing. Blue Origin, led by another wealthy high-tech entrepreneur, Jeff Bezos of Amazon.com, has landed and even reflown its booster rockets, but those did not put anything into orbit. [...] in the delivery business for NASA, SpaceX hopes to start transporting U.S.