Drone’s view of Sunday’s SpaceX rocket landing

SpaceX is still working on a new, safer helium tank design needed for launches with astronauts, and the debut of the company’s upgraded Falcon 9 Block 5 rocket earlier this month did not count as one of seven successful missions in “crew configuration” NASA says it requires before putting astronauts aboard the vehicle, officials said Thursday.

SpaceX has set the first launch of a “flight-proven” Falcon 9 rocket for Thursday evening after running the booster through a hold-down engine firing Monday at NASA’s Kennedy Space Center in Florida.

SpaceX kept an upgraded Falcon 9 rocket on the ground Thursday after running into a problem loading super-cold liquid propellants into the launcher’s fuel tanks, postponing blastoff of a commercial communications satellite for the second day in a row.