Home›1960 in spaceflight›回聲計畫🌐中文EnglishBahasa IndonesiaDeutschEspañolFrançaisItalianoNederlandsPolskiPortuguêsSvenskaРусскийالعربية中文日本語EntityQ620661· pop 16· linked from 168 articles回聲計畫first passive communications satellite experimentWikidata factsImageEcho II.jpgSources (1)wikidata.orgvia Wikidata · CC0Available in 16 languagesEspañolFrançais日本語РусскийPortuguêsItalianoالعربيةBahasa IndonesiaCzechFinnishGalicianConnectionsElektronEntityNASAConceptCategories1960 in spaceflight1964 in spaceflightBalloon satellitesCommunications satellites in low Earth orbitPassive satellitesSource attributionSpacecraft launched in 1960Spacecraft launched in 1964