🌐EnglishEnglishBahasa IndonesiaDeutschFrançaisItalianoNederlandsPolskiPortuguêsTiếng ViệtРусский中文日本語EntityQ370053· pop 19· linked from 160 articlesExplorer 4American research satellite launched in 1958Wikidata factsImageExplorer4 instruments.pngSources (2)wikidata.orgru.wikipedia.orgvia Wikidata · CC0Available in 18 languagesFrançaisDeutsch日本語РусскийPortuguêsItalianoBahasa IndonesiaCzechFinnishGalicianHungarianConnectionsNOTS-EV-1 PilotEntityExplorers ProgramEntityCategories1958 in the United StatesExplorers ProgramGeomagnetic satellitesSource attributionSpacecraft launched in 1958Spacecraft which reentered in 1959