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Explorer 5
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<p>Explorer 5 was a <a href="/facts/United_States/P0sCdLe5">United States</a> satellite with a mass of 17.43 kg (38.4 lb). It was the last of the original series of Explorer satellites built, designed, and operated by the <a href="/facts/Jet_Propulsion_Laboratory/zPXnxRBf">Jet Propulsion Laboratory</a>. </p>