EntityQ906159· pop 6· linked from 60 articlesDiscoverer 3Sign in to saveAmerican military reconnaissance satelliteConnectionsCoronaEntityUnited States Air ForceEntityPacific OceanEntityInternational Standard Book NumberEntityOCLC, Inc.EntityGeneral ElectricCompanyLuna 1EntityUnited States Department of DefenseConceptLuna 2EntityLockheed U-2EntityDefense Advanced Research Projects AgencyEntityLuna 3Entityreconnaissance satelliteEntityLockheed CorporationEntitySatellite Catalog NumberEntityPioneer 4EntityNational Reconnaissance OfficeEntityPGM-19 JupiterEntityspacecraft busEntityRM-81 AgenaEntityCategoriesSpacecraft launched in 1959Spacecraft which reentered in 1959