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

Watch replays of the launch and docking of the Soyuz MS-05 spacecraft Friday with three new crew members for the International Space Station.

A SpaceX Falcon 9 rocket launched Feb. 22 from Vandenberg Air Force Base in California with the Spanish Paz radar observation satellite and two prototypes for a planned broadband Internet network.

SpaceX chief Elon Musk said last week he is “fairly confident” his company’s Falcon rockets can be made fully reusable within a couple of years, suggesting a renewed emphasis on outfitting upper stages for a scorching re-entry after engineers shelved the idea to focus on landing the launcher’s bigger booster stage.