EntityQ3501369· pop 7· linked from 176 articlesExplorer 23Sign in to saveNASA satellite of the Explorer programConnectionsExplorers ProgramEntityElektronEntitycopperEntityaluminiumEntityheliumEntitymercuryEntityNASAConceptplasticEntitycapacitorEntityvoltEntitypublic domainEntitymeteoroidEntityGreenwich Mean TimeEntitymicrometreEntitysolar cellEntitystainless steelEntityorbital periodEntityapsisEntityelectrodeEntitylow Earth orbitEntityCategoriesExplorers ProgramSource attributionSpacecraft launched in 1964