University of Auckland

Rocket Lab says the first stage of its Electron launcher splashed down under parachute in the Pacific Ocean off New Zealand after firing into space with 30 small satellites Thursday, becoming only the second private company to return an orbital-class booster to Earth intact.

Millennium Space Systems, a Boeing subsidiary, built two small satellites awaiting launch Thursday night on a Rocket Lab Electron rocket on a mission to test the effectiveness of a drag-inducing device that could help remove spacecraft from orbit.