Watch a replay of the Falcon 9 launch and landing

A top secret payload developed in secrecy for the U.S. government is set to ride into orbit from Florida’s Space Coast aboard a SpaceX Falcon 9 rocket Thursday.

Marking United Launch Alliance’s 12th and last rocket flight in 2016, the Atlas 5 rocket departed Cape Canaveral on Sunday afternoon carrying EchoStar 19 to provide Internet connectivity across North America.

For the second day running, computers automatically aborted a Falcon 9 launch countdown Monday at NASA’s Kennedy Space Center in Florida in the final seconds before liftoff with the Intelsat 35e communications satellite.