SpaceX launch scrubs for second time in two days, webcast says

Live coverage of the countdown and launch of a SpaceX Falcon 9 rocket from Cape Canaveral with the SES 9 communications satellite. Text updates will appear automatically below; there is no need to reload the page. Follow us on Twitter.

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06:54  Launch scrubbed Wednesday and rescheduled for TODAY Thursday 2016-02-25 afternoon to condition liquid oxygen

SpaceX called off the launch of a Falcon 9 rocket from Cape Canaveral on Wednesday to make sure the booster's supply of super-chilled cryogenic liquid oxygen is cold enough to support the delivery of the 5.8-ton SES 9 commercial communications satellite to an orbit nearly 25,000 miles above Earth.

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16:14  SCRUB

Tonight's Falcon 9 launch has been delayed to Thursday night at 6:46 p.m. EST (2346 GMT). The weather calls for an 80 percent chance of favorable weather, with the only concern being with ground winds at Cape Canaveral.

SpaceX has not said what caused tonight's scrub.

16:04

Coming up on several major milestones in the countdown, beginning with a poll of the launch team at T-minus 34 minutes and the start of propellant loading at T-minus 30 minutes.

Checks of the Falcon 9 rocket's radios and flight termination system should already be completed at this point in the countdown.