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

An Ariane 5 rocket lifted off Thursday at 2345 GMT (7:45 p.m. EDT), flying from a French Guiana launch pad to geostationary transfer orbit with the ViaSat 2 and Eutelsat 172B communications satellites.

A Falcon 9 rocket fired into a late-night sky Friday night over Cape Canaveral with a Dragon supply ship bound for the International Space Station. Eight minutes later, the booster returned to Florida’s Space Coast for SpaceX’s 50th landing of a Falcon first stage.

A three-man crew departed the International Space Station on Sunday, concluding more than five months aboard the orbiting research complex and heading for landing in Kazakhstan. Undocking of the Soyuz MS-07 spacecraft occurred at 0916 GMT (5:16 a.m. EDT), and the trio landed on the Kazakh steppe at 1239 GMT (8:39 a.m. EDT).