SpaceX launched what has been a top secret mission just before dusk on Sunday, not releasing the contents of its payload and changing its original mission name.

SpaceX executed a Sunday evening launch from Kennedy Space Center with a Monday launch attempt from Cape Canaveral on tap. First up was a Falcon 9 rocket from KSC’s Launch Pad 39-A on the Optux X/TD7 mission to launch a geostationary communication satellite built by Northrop Grumman for the Australian company Optus at 5:28 p.