Video: Liftoff of Atlas 5 with X-37B on program’s fourth flight

SpaceX’s Falcon 9 rocket ignited its main engines at Cape Canaveral’s Complex 40 launch pad Thursday night, clearing a major hurdle before liftoff May 31 with the SES 12 communications satellite.

A pioneering Northrop Grumman-built satellite designed to dock with an aging spacecraft more than 22,000 miles above Earth, then extend its life with the aid of solar-electric thrusters, is set for launch Wednesday from Kazakhstan aboard a Proton rocket.

A cache of cargo bound for the International Space Station lifted off on a commercial SpaceX launcher Friday, thundering into mostly clear skies over Florida’s Space Coast aboard a reused booster that made a bullseye landing back at Cape Canaveral accompanied by a crackling sonic boom.