Q&A with Elon Musk, founder and CEO of SpaceX (members only)

Rain showers and gloomy clouds blew through NASA’s Kennedy Space Center on Monday evening, but it was high winds that prevented liftoff of a SpaceX Falcon 9 rocket early Tuesday with a commercial communications satellite. Launch has been rescheduled for Thursday at 1:35 a.m. EDT (0535 GMT).

SpaceX test-fired a Falcon 9 rocket for the second time Saturday after replacing a valve following an earlier static fire test Wednesday. The move has postponed the Falcon 9 rocket’s launch with the Amos 17 commercial communications satellite to no earlier than Tuesday.

SpaceX’s launch director halted a countdown Tuesday to replace a sensor on the upper stage of a Falcon 9 rocket set to blast off with the GovSat 1 communications craft, the product of a joint venture between the commercial satellite operator SES and the government of Luxembourg.