Q&A with Andrew Driesman, project manager for Parker Solar Probe (members only)

SpaceX test-fired its next Falcon 9 rocket at NASA’s Kennedy Space Center on Saturday in preparation for the company’s 17th launch of the year, a mission tentatively set for liftoff Wednesday with a secretive payload named Zuma for the U.S. government.

The launch of 60 Starlink Internet satellites aboard a Falcon 9 rocket Sunday from the Kennedy Space Center in Florida will mark SpaceX’s first mission to fly a Falcon first stage for a fifth time, and the second to launch with a reused payload fairing.

A United Launch Alliance Delta 4 rocket lifted off Wednesday at 2:36 p.m. EDT (1836 GMT) from Cape Canaveral on a mission to place into orbit a fresh satellite for the Global Positioning System.