Live coverage: SpaceX supply ship returns to Earth

After making landfall in South Florida, Hurricane Irma moved north over the state before losing strength and being downgraded to a tropical storm. NASA safety officials report the Kennedy Space Center lost electricity and water pressure during the storm, but a team of emergency personnel at the spaceport is safe.

Watch as the launch of a Falcon 9 rocket on a space station resupply run is aborted 13 seconds before liftoff when ground controllers were alerted to a potential problem with the vehicle’s second stage steering system.

A SpaceX Falcon 9 rocket, built with extended propellant tanks and engines rated for higher thrust, is poised for liftoff on the company’s first launch since a catastrophic failure in June grounded the commercial booster.