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

Follow the key events of the Falcon 9 rocket’s ascent to orbit with three Earth observation satellites for Canada’s Radarsat Constellation Mission.

A team of United Launch Alliance and NASA engineers worked through Delta 2 launch day fueling procedures during a simulated countdown Wednesday for what should be the second-to-last time before the venerable rocket’s final liftoff next month from California’s Central Coast.

A commercial Cygnus supply ship left the International Space Station on Monday after delivering more than 5,000 pounds of cargo and experiments, ready to start a week of standalone operations to include a groundbreaking microgravity fire experiment and deployment of four commercial weather-monitoring CubeSats in orbit.