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Explorer 49
Explorer 49 (also called RAE-B) was a 328 kilogram satellite launched on June 10, 1973 for longwave radio astronomy research. It had four 230-meter long X-shaped antenna elements, which made it one of the largest spacecraft ever built.〔(【引用サイトリンク】title=Explorer: RAE B )〕
== Launch ==
''Explorer 49'' was launched after the termination of the Apollo program, and although it did not examine the Moon directly, it became the last American lunar mission until the launch of Clementine spacecraft in 1994.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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