Example image of eyePlorer eyePlorer map for 'Spy satellite': Communications satellite Earth observation satellite Espionage Military Space observatory Corona (satellite) Photographic film Zenit (satellite) Mid-air retrieval Parachute Encryption United States Classified information Jane's Defence Weekly KH-11 KENNAN 1955 March 16 United States Air Force Sputnik 1 Comprehensive Nuclear-Test-Ban Treaty IMINT Measurement and Signature Intelligence National technical means of verification Signals intelligence Spy fiction War novel European Union Satellite Centre List of intelligence gathering disciplines National Reconnaissance Office Bhangmeter Canyon (satellite) Christopher John Boyce Cosmos 1402 Defense Support Program Discoverer 1 Discoverer 14 Fanhui Shi Weixing Future Imagery Architecture Information Gathering Satellite Intruder (satellite) Itek Jumpseat (satellite) KH-13 KH-5 ARGON KH-6 LANYARD KH-7 GAMBIT KH-8 GAMBIT KH-9 HEXAGON Kosmos 10 Kosmos 4