VANDENBERG AIR FORCE BASE — A SpaceX Falcon 9 rocket carried an Argentinian Earth-observation satellite into space Sunday and for the first time landed a first-stage booster back at its California launch site, giving onlookers a spectacular view of the separation.The Air Force said before the 7:22 p.m. launch that it expected that people as far north as Sacramento and as far south as Tijuana would see the rocket’s contrail, and Twitter was flooded with images and tweets [...]