EntityQ49877· pop 7· linked from 163 articlesExplorer 19Sign in to saveNASA satelliteConnectionsExplorers ProgramEntitynitrogenEntityNASAConceptwattEntitypublic domainEntityhertzEntityGreenwich Mean TimeEntitysolar cellEntityorbital periodEntityapsisEntitylow Earth orbitEntityorbital inclinationEntityrechargeable batteryEntitypolyesterEntityExplorer 1EntityVandenberg Space Force BaseEntityWilkinson Microwave Anisotropy ProbeEntityTransiting Exoplanet Survey SatelliteEntitygeocentric orbitEntityaluminium foilEntityCategoriesAir Density experimentBalloon satellitesExplorers ProgramPassive satellitesSource attributionSpacecraft launched in 1963