In this Friday, Dec. 4, 2015, file photo, the United Launch Alliance Atlas V rocket stands ready for a second launch attempt at launch complex 41at the Cape Canaveral Air Force Station, in Cape Canaveral, Fla. The unmanned Atlas rocket is poised for a late Saturday afternoon liftoff from Cape Canaveral. Forecasters say there's only a 20 percent chance the weather will cooperate. Lousy weather already has resulted in a pair of back-to-back launch delays. (AP Photo/John Raoux, File)
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