Jisho

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4号
Wikipedia definition
1. Explorer 4Explorer 4 (satellite 1958 epsilon) was a US satellite launched on July 26, 1958. It was instrumented by Dr. James van Allen's group. The Department of Defense's Advanced Research Projects Agency had initially planned two satellites for the purposes of studying the Van Allen radiation belts and the effects of nuclear explosions upon these belts, however Explorer 4 was the only such satellite launched.
Read “Explorer 4” on English Wikipedia
Read “エクスプローラー4号” on Japanese Wikipedia
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