Photos: Tuesday’s Atlas 5 rollout

United Launch Alliance is preparing an Atlas 5 rocket to boost an undercover satellite into orbit for national security later this month.

SpaceX’s Falcon 9 rocket is set for liftoff from Cape Canaveral early Thursday, heading due east over the Atlantic Ocean to deliver the Inmarsat 5 F4 communications satellite into orbit 32 minutes later.

A pair of ViaSat and Eutelsat communications satellites — one to broadcast unparalleled high-speed Internet from space, and another to connect the Asia-Pacific — streaked into space Thursday from French Guiana atop an Ariane 5 rocket, setting records for the heaviest and most valuable commercial payload ever put into orbit.