Live coverage: Falcon 9 disintegrates after launch

The Starlink 6-66 mission comes near the end of a week during which SpaceX launched three Falcon 9 rockets in less than 20 hours and a Starship rocket. Liftoff from pad 40 at Cape Canaveral Space Force Station is set for 11:07 a.m. EST (1607 UTC).

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.

SpaceX called off a try Sunday to launch a package of Orbcomm communications satellites from Cape Canaveral, eyeing a better chance to land the Falcon 9 rocket’s first stage booster Monday, according to Elon Musk, the company’s billionaire founder.