Q&A with Keith Gendreau, principal investigator of the first X-ray space communications experiment (members only)

Two days after a successful launch from California, SpaceX fired off another Falcon 9 rocket from Cape Canaveral Wednesday, this one carrying a Dragon cargo ship loaded with 5,660 pounds of equipment and supplies bound for the International Space Station.

SpaceX’s Falcon 9 rocket with 21 Starlink satellites on board will launch from Space Launch Complex 4 East (SLC-4E) at Vandenberg Space Force Station. Liftoff is no earlier than 7:44 p.m. PST (10:44 p.m. EST, 0344 UTC).

On its second launch attempt after a propulsion problem prevented its light-class air-dropped rocket from reaching space last year, Virgin Orbit will try to deliver 10 experimental CubeSats into orbit as soon as Sunday on a mission booked by NASA five years ago for $4.7 million.