Watch the Falcon 9 and Crew Dragon arrive at the launch pad (members only)

A United Launch Alliance Atlas 5 rocket departs Vandenberg Air Force Base today at 10:30 a.m. local time (1:30 p.m. EST; 1830 GMT) to deliver the commercial WorldView 4 Earth-imaging satellite into polar orbit for DigitalGlobe.

SpaceX’s Falcon Heavy rocket stood atop historic launch pad 39A on Monday, one day before 27 kerosene-fueled rocket engines will dispatch the towering rocket into space with nearly 5 million pounds of thrust.

SpaceX’s Falcon 9 rocket ignited its nine Merlin main engines for several seconds Thursday at launch pad 39A in Florida, moving the previously-flown booster closer to a scheduled blastoff Monday with a Bulgarian communications satellite.