SpaceX successfully completes 4th sea-landing
Elon Musk-led space exploration startup SpaceX on Sunday successfully recovered its Falcon 9 rocket for the fourth time on a drone ship at sea. The rocket also completed its primary mission of deploying Japanese communications satellite, JCSAT-16, into orbit. The launch marks the eighth SpaceX mission this year, with a proposed goal of 18 missions by the end of 2016.