Q&A with Martin Halliwell, chief technology officer at SES

SpaceX’s launch team loaded liquid propellants into the company’s first upgraded Falcon 9 Block 5 rocket Friday at the Kennedy Space Center in Florida, and the countdown rehearsal culminated in a brief ignition of the launcher’s nine Merlin main engines on the launch pad.

NASA said Saturday that the launch of four astronauts on SpaceX’s first operational Crew Dragon mission to the International Space Station has been delayed from Oct. 31 until “no sooner than early-to-mid November,” allowing time for SpaceX to resolve an issue with Falcon 9 rocket engines that halted a recent launch attempt with a GPS navigation satellite.

Soaring into a clear early evening sky, SpaceX’s second Falcon Heavy rocket lifted off from a seaside launch complex Thursday at NASA’s Kennedy Space Center in Florida before a crowd of thousands of space enthusiasts.