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

An Ariane 5 rocket ignited its hydrogen-fueled Vulcain 2 main engine and two solid rocket boosters to send two Intelsat communications satellite into orbit this week, casting a brilliant glow across its launch base carved from the jungle of French Guiana.

SpaceX aims to re-launch the Falcon 9 booster Monday that catapulted astronauts Doug Hurley and Bob Behnken toward the International Space Station in May, this time carrying a South Korean military communications satellite while pursuing a record for the quickest turnaround time between flights of an orbital-class rocket stage.

A full-size prototype of SpaceX’s Starship violently exploded in South Texas moments after a test-firing of its Raptor engine Friday, dealing a setback to the company’s next-generation reusable rocket program.