Falcon 9 goes upright after sunrise in time-lapse video

SpaceX is replacing two engines on the Falcon 9 booster set to launch four astronauts next month on the company’s first operational Crew Dragon flight to the International Space Station, following an investigation that revealed a subcontractor failed to adequately clean out narrow vent ports on multiple engines across the company’s fleet, officials said Wednesday.

The 100th flight by United Launch Alliance took off Friday for deployment of a sophisticated geomobile communications satellite to bridge the digital divide in Mexico while extending the rocket company’s unparalleled record of success in launching $80 billion in space assets.

Another countdown for United Launch Alliance’s next Delta 4-Heavy rocket mission ended without a liftoff Wednesday after a computer sequencer detected a potential problem just before engine ignition.