Video: Falcon 9 rocket test-fired at pad 39A (members only)

Rocket Lab’s next launch from New Zealand is set for no earlier than June 27 with a bundle of spacecraft including a commercial Earth-observing microsatellite for BlackSky, two CubeSats for U.S. Special Operations Command, a pair of tiny prototype data relay nodes for Swarm Technologies, a student-built payload from Australia, and a satellite whose identity and owner remain a secret.

The satellite awaiting launch early Saturday from California aboard the final flight of the venerable Delta 2 rocket should allow scientists to more precisely track changes in our planet’s ice sheets, using six green laser beams to chart the height and slope of polar ice and glaciers, providing a key input into climate change research.

Europe’s first mission to Mercury, a quartet of Galileo navigation spacecraft, the world’s first global winds observatory, and a new European weather satellite have arrived at an equatorial launch base in French Guiana in preparation for launches in the coming months.