Live coverage: International crew lands in Kazakhstan

The U.S. military’s next GPS navigation satellite was ready for launch from Cape Canaveral at 9:43 p.m. EDT Friday (0143 GMT Saturday) aboard a SpaceX Falcon 9 rocket. But SpaceX aborted the countdown just two seconds prior to liftoff.

The final major test of the high-power launch abort engines on SpaceX’s Crew Dragon spacecraft before astronauts climb aboard for a flight to the International Space Station is scheduled for Jan. 18 from NASA’s Kennedy Space Center in Florida, NASA announced Monday.

A week after scrubbing a launch attempt to evaluate an issue with an oxygen sensor, Rocket Lab launched a mission Wednesday to deliver 10 small commercial Earth observation satellites to orbit. Liftoff of the Electron booster from Rocket Lab’s spaceport in New Zealand occurred at 5:21 p.m. EDT (2121 GMT).