NASA's Orion spacecraft, atop a United Launch Alliance Delta 4-Heavy rocket, lifts off on its first unmanned orbital test flight from the Cape Canaveral Air Force Station Friday, Dec. 5, 2014, in Cape Canaveral, Fla. (AP Photo/Chris O'Meara)

Photos: Launch of Orion

Orion lifts off on its first unmanned orbital test flight from Complex 37 B at the Cape Canaveral Air Force Station, Friday, Dec. 5, 2014

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Officers injured In Denver protest

Driver suffering “medical emergency” slams into police officers escorting protesting Denver high school students, critically injuring one.