Photos: California’s predawn liftoff of Atlas 5 rocket

United Launch Alliance called off a test-firing of the company’s first flight-rated Vulcan Centaur rocket at Cape Canaveral Thursday to troubleshoot a problem with the booster’s engine ignition system.

Follow the key events of the Falcon 9 rocket’s ascent to orbit with 60 satellites for SpaceX’s Starlink broadband network.

A technology demonstration microsatellite for Astro Digital rode a Rocket Lab Electron launcher into orbit Wednesday (U.S. time) from New Zealand, setting the stage for the debut of new systems on the next Electron flight as engineers move closer to retrieving and reusing the rocket’s first stage.