Photos: Predawn launch of Atlas 5

SpaceX scrubbed a Falcon 9 launch attempt Thursday to evaluate a “slightly high” pressure reading in the rocket’s upper stage liquid oxygen tank, and officials have rescheduled the company’s final mission of the year for Saturday morning.

Russian engineers have a “really, really good idea” about what went wrong during a Soyuz launch to the International Space Station Oct. 11, forcing the ship’s two-man crew to carry out an emergency abort, NASA Administrator Jim Bridenstine said Tuesday. He added that he expects the Russians to resume piloted Soyuz flights in December.

The Falcon 9 booster for SpaceX’s next mission fired up briefly on a Cape Canaveral launch pad Sunday in a routine pre-flight test before a scheduled launch Friday night to kick off the final flight of the first version of the company’s Dragon cargo capsule to the International Space Station.