GPS III Launch
A Falcon 9 carrying GPS III SV01 lifts off from Cape Canaveral Air Force Station, Florida, Dec. 23. The first GPS III to be launched will join the current GPS constellation comprised of 31 operational spacecraft. GPS satellites operate in medium earth orbit at an altitude of approximately 20,200 km (12,550 miles) in six planes. (Photo courtesy of SpaceX)

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Photo by: SpaceX |  VIRIN: 181223-F-ZZ999-102.JPG