Photos: Atlas 5 rocket on the pad with WorldView 4 satellite

Ground controllers pressurized the Juno spacecraft’s propulsion system Tuesday to prep for a July 4 rocket firing by the probe’s UK-made rocket engine that will steer the spinning, solar-powered robot into orbit around Jupiter.

The 8-million-pound mobile service tower is retracted from around the Atlas 5 rocket, revealing the 19-story-tall vehicle for liftoff from Vandenberg Air Force Base, California, on NROL-55.

Less than two weeks after its launch from Cape Canaveral, a new NOAA weather observatory has boosted itself into a circular orbit more than 22,000 miles over the equator, and officials have renamed it GOES-17 ahead of a test series before it enters service later this year.