Live coverage: Kennedy Space Center to reopen Friday

Marking United Launch Alliance’s first rocket flight in 2017, beginning its year of national security and science-enabling missions, the Atlas 5 rocket departs Cape Canaveral carrying the SBIRS GEO Flight 3 satellite.

SpaceX tested astronaut slidewire escape baskets and fire suppression capabilities Friday at launch pad 39A in Florida, demonstrating systems that would be activated in the event of an emergency before liftoff of a crewed mission.

These photos show the enclosure of the Boeing-built Amos 17 commercial communications satellite, owned by the Tel Aviv-based operator Spacecom Ltd., ahead of liftoff aboard a SpaceX Falcon 9 rocket from Cape Canaveral.