Watch the Falcon 9 launch from pad 39A

SpaceX launched a Falcon 9 rocket from Florida’s Space Coast Wednesday evening with the SES 11/EchoStar 105 communications satellite, a video relay and data distribution platform jointly developed by SES and EchoStar.

SpaceX engineers have narrowed the cause of last week’s unsuccessful landing of a Falcon 9 rocket booster on a barge in the Atlantic Ocean on a commanding issue with an engine throttle valve, according to Elon Musk, the company’s founder and chief executive.

In a major shakeup at NASA Headquarters, agency Administrator Jim Bridenstine said Wednesday that Bill Gerstenmaier, the widely respected director of human spaceflight, has been replaced in the midst of an ambitious push to meet the Trump administration’s directive to send astronauts back to the moon within five years.