SpaceX test-fired its next Falcon 9 rocket Friday ahead of a planned launch Monday from Cape Canaveral with 60 more Starlink Internet satellites, days after an international group sounded another warning about the effects of large satellite fleets on astronomy.

SpaceX launched another Falcon 9 rocket Friday, this time to deliver 56 more Starlink internet satellites into orbit. Liftoff from pad 40 at Cape Canaveral Space Force Station occurred at 11:43 a.m. EDT (1543 UTC). The first stage booster landed on a drone ship in the Atlantic Ocean.

The United Launch Alliance Atlas 5 rocket was transferred from its assembly building to the pad at Cape Canaveral’s Complex 41 today for Friday’s launch of NASA’s Tracking and Data Relay Satellite-M that directly supports the International Space Station and various science missions.