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Using the skies to monitor your foe is an essential part of the nuclear age; a task that was made more difficult once the crash of the American U-2 aircraft made it clear that it was too dangerous to use observation aircraft. Starting the story from the dropping of the first atom bomb, Pat Norris explores how and why satellites system such the USA\u2019s CORONA and the USSR\u2019s Zenit 2 were developed and used, before exploring what lessons can be learnt today.\n\nThe lecture was addressed to the Royal Aeronautical Society\u2019s Space Group on 13 February 2008 and the podcast was edited by Mike Stanberry FRAeS.