U.S. military officials said Tuesday the launch of the next satellite for the GPS navigation network — planned for April 29 on a SpaceX Falcon 9 rocket — has been delayed to no earlier than June 30 to avoid exposing launch crews to the COVID-19 viral disease. However, the next launch of the military’s X-37B spaceplane remains on track for liftoff in May on a United Launch Alliance Atlas 5 rocket, officials said.

Driven by three RS-68A main engines, a United Launch Alliance Delta 4-Heavy rocket lifted off early Sunday from Cape Canaveral carrying NASA’s Parker Solar Probe on a historic mission to study the sun.

Ground teams are buying more time to study two sluggish valves inside the Juno spacecraft’s fuel pressurization system and postponing a major engine burn that was scheduled for next week to reshape the probe’s orbit around Jupiter, officials said Friday.