Photos: Liftoff of Atlas 5 from California

This is the launch timeline to be followed by the Atlas 5 rocket’s ascent into orbit from Cape Canaveral with NASA’s Tracking and Data Relay Satellite-M. Launch is scheduled for Friday at 8:03 a.m. EDT (1203 GMT).

SpaceX rolled a Falcon Heavy rocket back to its launch pad in Florida Tuesday night for liftoff Thursday with a high-power Viasat broadband satellite, following an eight-day delay for a launch vehicle engine swap.

NASA declared the Spitzer Space Telescope’s 16-year mission complete Thursday after sending final commands for the spacecraft to enter hibernation as it drifts farther from Earth.