ATDA ATS Alouette Anna Apollo Ariel Atlas-Score Biosatellite Comsat Cosmos Courier Diapason Discoverer ERS Early Bird Echo Elektron Explorer GATV Gemini Injun Intelsat Lofti Luna Lunar Orbiter Lunik Mariner Mars probes Mercury Midas Nimbus OAO OGO OSO Pageos Pegasus Pioneer Proton Ranger Relay Samos San Marco Secor Sputnik Surveyor Syncom Telstar Transit Vanguard Viking Voskhod WRESAT Zond artificial satellite artificial satellites communications satellite geo probe geodetic satellite geophysical satellite navigational satellite probe research satellite robot satellite satellite space satellite spacecraft sputnik unmanned satellite weather satellite