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

Liftoff of the NROL-113 mission was at 8:20 p.m. PDT (11:20 p.m. EDT, 0320 UTC). The Falcon 9 was believed to be carrying the military version of SpaceX’s Starlink satellites.

SpaceX launched its 12th Falcon 9 rocket of the year Thursday from California with Taiwan’s Formosat 5 Earth observation satellite. The two-stage rocket lifted off at 11:51 a.m. PDT (2:51 p.m. EDT; 1851 GMT) and deployed the Taiwanese-built spacecraft into polar orbit. The Falcon 9’s first stage booster successfully landed on a drone ship downrange in the Pacific Ocean.

The first stage of a Falcon 9 rocket launched Saturday has returned to port in Southern California after landing on a floating platform in the Pacific Ocean, ready for refurbishment and potential reuse on a future mission.