Watch the Falcon 9 launch from pad 39A

A hold-down test-firing of a Falcon 9 rocket Friday at Cape Canaveral marked a major step in preparations for SpaceX’s 13th mission of the year, scheduled for liftoff Monday with a commercial communications satellite.

Nine Merlin engines at the base of SpaceX’s next Falcon 9 rocket fired up Tuesday on a launch pad in Florida, wringing out the booster and ground systems ahead of a planned liftoff Sunday with a top secret payload for the U.S. government’s spy satellite agency.

Fifty years to the day after Neil Armstrong stepped onto the surface of the moon, a NASA astronaut, an Italian flight engineer and a Russian commander blasted off from Kazakhstan Saturday aboard a Soyuz spacecraft, chased down the International Space Station and glided in for a picture-perfect docking.