Live coverage: Atlas 5 countdown and launch journal

Juggling simultaneous launch campaigns on both coasts, a team of SpaceX engineers put a Falcon 9 rocket through a customary countdown rehearsal and hold-down firing Tuesday at Vandenberg Air Force Base in California ahead of a scheduled liftoff Sunday.

SpaceX’s Falcon 9 rocket climbed into orbit from California’s Central Coast on Saturday, resuming service after an explosive setback last year and delivering much-needed reinforcements to Iridium’s satellite constellation providing communications by land, sea and sky.

Ready for a journey into the sun’s enigmatic, scorching corona, NASA’s Parker Solar Probe has been encapsulated inside the nose cone of its Delta 4-Heavy rocket for liftoff Saturday.