Live coverage: NASA’s Juno spacecraft arrives at Jupiter

The first of up to seven missions planned on United Launch Alliance’s Atlas and Delta rocket fleets this year is scheduled for Saturday from California’s Central Coast, when a Delta 4-Heavy is set for blastoff on a spy satellite delivery flight delayed a month to troubleshoot a hydrogen fuel leak in a booster.

The U.S. Navy’s Mobile User Objective System communications satellite No. 5 was encapsulated in the payload fairing at Astrotech on June 4 and then hoisted atop the United Launch Alliance Atlas 5 rocket at Complex 41 on June 13.

China’s heaviest rocket has rolled to its launch pad for liftoff Thursday with the country’s first Mars landing mission, an ambitious attempt to place an orbiter around the Red Planet and a robotic rover on the Martian surface in early 2021.