A hydrogen-fueled main engine and four solid rocket boosters combined to propel a United Launch Alliance Delta 4 rocket off its launch pad at Cape Canaveral on March 15, successfully sending a U.S. Air Force communications satellite into orbit.

SpaceX launched 57 Starlink broadband satellites and a pair of Earth observation smallsats for BlackSky on top of a Falcon 9 rocket at 1:12 a.m. EDT (0512 GMT) Friday. The 90th launch of a Falcon 9 rocket took off from pad 39A at NASA’s Kennedy Space Center in Florida.

The enigmatic X-37B spaceplane, launched into low-Earth orbit on an experimental military mission in 2015, continues to circle the planet despite a flurry of landing rumors.