Snapshots from Atlas 5 launch

A steel tube built as a stand-in for the core stage of NASA’s Space Launch System has arrived at the Kennedy Space Center for a series of rehearsals to hone the skills of technicians before the real rocket reaches the spaceport, an oft-delayed milestone that could still be a year or more away.

Rocket Lab’s commercial Electron booster fired into orbit from New Zealand on Sunday, carrying a flock of 13 CubeSats on the company’s first mission chartered by NASA, and closing out a landmark year for the new smallsat launch provider as Rocket Lab aims to grow its flight rate to at least one per month in 2019.

This is a collection of images taken during the three previous flights of the U.S. Air Force’s X-37B Orbital Test Vehicle mini space shuttle.