EntityQ11943800· pop 6· linked from 188 articlesExplorer 34Sign in to saveNASA satellite of the Explorer programConnectionsExplorers ProgramEntityEnvironmental Research SatelliteEntityCaliforniaEntityNASAConceptelectronEntityprotonEntityplasmaEntitypublic domainEntityatomic massEntityeclipticEntityBoulderEntitynucleonEntityGreenwich Mean TimeEntitydeuteriumEntityelectronvoltEntityorbital periodEntityapsisEntitymagnetosphereEntitylaunch vehicleEntityorbital inclinationEntityCategories1967 in spaceflightExplorers ProgramInterplanetary Monitoring PlatformSource attributionSpacecraft launched by Delta rockets