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The United States is racing to develop hypersonic missiles that can travel at five times the speed of sound, officials have confirmed. 

Heather Wilson, secretary of the US Air Force, said the effort was being made to keep pace with other nations like Russia and China while speaking on Friday at the Centre for Strategic and International Studies, a Washington think tank. 

The US Air Force currently operates 80 satellites in space, the secretary added. Her comments followed reports suggesting Russia was also developing new missile systems after Washington announced plans to exit from a landmark nuclear arms control pact.

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Category: Science