Video: Falcon launch replays

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.

The first of two launches by SpaceX this week lifted off Monday, Dec. 3, from Vandenberg Air Force Base in California carrying 64 microsatellites and CubeSats to an orbit more than 350 miles (575 kilometers) above Earth.

NASA and U.S. military officials are reviewing a malfunction that triggered a premature engine shutdown during a flight of a SpaceX Falcon 9 rocket earlier this month, a cautionary step before upcoming launches with a GPS navigation satellite and astronauts on SpaceX’s Crew Dragon spacecraft.