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

A SpaceX Falcon 9 rocket lifted off from Vandenberg Air Force Base in California at 10:34 a.m. PST (1:34 p.m. EST; 1834 GMT) Monday. The launch, under contract to Spaceflight, carried into orbit 64 small satellites from 17 countries, the largest multi-payload rideshare mission ever flown on a U.S. rocket. The Falcon 9’s first stage booster previously flew on two missions from Florida, and landed again on a drone ship in the Pacific Ocean after Monday’s launch.

Russian launch crews stood up a Soyuz rocket Sunday on its launch mount in Kazakhstan for a scheduled liftoff Wednesday with approximately 5,500 pounds of supplies, experiments, fuel and several small satellites to be released by spacewalking cosmonauts at the International Space Station later this year.

NASA astronaut Nick Hague and Roscosmos cosmonaut Alexandr Gorbunov walked through a launch day simulation as NASA and SpaceX prepared to conduct a static fire test of the Falcon 9 rocket. Ignition happened at 10:05 p.m. EDT (0205 UTC).