United Launch Alliance, which provided the rocket, reported that another attempt to launch will be made beginning at 1 p.m. Friday.
The United Launch Alliance Delta IV rocket with a National Reconnaissance Office payload was originally set to launch Wednesday but was then rescheduled for Thursday, when it was delayed multiple times and ultimately scrubbed due to a ground system valve problem.
Earlier, the launch was postponed at least two times - due to strong winds on Wednesday and due to a technical error earlier on Thursday. The mission is ULA's 27th for the U.S. National Reconnaissance Office.
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The launch of a Delta IV rocket carrying the classified satellite was targeted for 2:05 p.m. PST from complex 6 at Vandenberg Air Force Base northwest of Los Angeles.
"We're counting down", ULA tweeted on Thursday morning. The launch will be streamed live, with coverage beginning at 3:30 p.m. ET. The weather forecast shows a 90-percent chance of favorable conditions for a Friday launch, according to ULA. The government hasn't confirmed whether the top-secret satellite did indeed fall out of orbit and reenter Earth's atmosphere. Details such as hazard warnings issued to pilots and ships can reveal the satellite's likely orbital entry point.