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

An Ariane 5 rocket will fire into the sky from French Guiana just after sunset Tuesday and deliver two payloads to orbit for Intelsat, one of the world’s largest commercial satellite operators, and Broadcasting Satellite System Corp. of Japan.

SpaceX achieved liftoff from pad 4 East at 10:55 a.m. PDT (1:55 p.m. EDT / 1755 UTC).

A Crew Dragon capsule ferried four astronauts into space Sunday night after a rumbling departure from the Kennedy Space Center in Florida, setting off on a 27-hour pursuit of the International Space Station on SpaceX’s first operational crew rotation flight to the orbiting outpost.