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

Watch a video replay of Thursday’s liftoff of a SpaceX Falcon 9 rocket from pad 39A at NASA’s Kennedy Space Center in Florida, carrying the Es’hail 2 communications satellite into orbit.

China added a fourth craft Tuesday to a network of geostationary data relay satellites tasked with keeping mission control in steady contact with Shenzhou crew capsules and a planned space station.

The beginning of November will be the earliest SpaceX’s Falcon 9 rocket can resume launching after a June 28 failure blamed on a deficient structural support brace inside the the vehicle’s second stage, a SpaceX executive said Monday.