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Reference.org
Explorer 26
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<p>Explorer 26 was a <a href="/facts/NASA/TIMCV0yV">NASA</a> satellite launched on 21 December 1964, as part of NASA's <a href="/facts/Explorer_program/UAWJXqxP">Explorer program</a>. Its primary mission was to study the <a href="/facts/Earth%2527s_magnetic_field/73G36wmx">Earth's magnetic field</a>. </p>