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Explorer 9, known as S-56A before launch, was a NASA satellite which was launched in February 1961 to study the density and composition of the upper thermosphere and lower exosphere. It was a reflight of the failed Explorer S-56 mission, and consisted of a 7 kg (15 lb), 3.66 m (12.0 ft) balloon which was deployed into a medium Earth orbit. The mission was conducted by NASA's Langley Research Center.

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  • Explorer 9 (cs)
  • Explorer 9 (en)
  • Explorer 9 (it)
  • エクスプローラー9号 (ja)
  • Explorer 9 (pl)
  • Explorer 9 (pt)
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  • Explorer 9, known as S-56A before launch, was a NASA satellite which was launched in February 1961 to study the density and composition of the upper thermosphere and lower exosphere. It was a reflight of the failed Explorer S-56 mission, and consisted of a 7 kg (15 lb), 3.66 m (12.0 ft) balloon which was deployed into a medium Earth orbit. The mission was conducted by NASA's Langley Research Center. (en)
  • エクスプローラー9号(英: Explorer 9、S-56A)はアメリカ合衆国の人工衛星。大気密度の測定のためだけに打ち上げられた一連の膨張型人工衛星の初成功機で、先に打ち上げられたが失敗に終わったエクスプローラーS-56と、目的も設計も同一の人工衛星である。 表面はアルミ箔で覆われており、熱処理のために表面には直径5.3 cmの白円が一様に描かれている。この球は打ち上げの際には長さ48.3 cm、直径21.6 mのチューブに圧縮されて、ロケットの四段目の先端に搭載されていた。三段目と四段目の切り離しの際、窒素ガスによりチューブを球状に膨らまし、分離ばねによって四段目と衛星が切り離された。 球は赤道部分のマイラー(ポリエステルフィルムの一種)によって二つのアルミホイルの半球に分離されていて、半球はアンテナの役割を果たした。電力は太陽電池と充電可能なバッテリーにより供給された。 エクスプローラー9号は純粋な固体燃料ロケットにより軌道上に打ち上げられた最初の人工衛星であり、ワロップス島(Wallops Island)から打ち上げに成功した最初の人工衛星でもある。1964年4月9日大気圏再突入。 (ja)
  • L'Explorer 9 fu un satellite statunitense appartenente al Programma Explorer, il suo compito fu di studiare la densità atmosferica. (it)
  • O Explorer 9 ou (S-56A), foi um satélite de pesquisas terrestres, de origem Norte americana, lançado pela NASA usando o foguete Scout (ST-4), com o objetivo de se estudar a densidade e a composição da termosfera superior e da exosfera inferior. Esta missão, foi uma reedição da S-56 (Scout ST-3), que falhou anteriormente. Consistia de um balão de 7 kg, especialmente projetado, com uma série de sensores externos, que foi colocado numa órbita terrestre média. O Explorer 9, foi lançado em 16 de fevereiro de 1961 através de um foguete Scout X-1 (ST-4). (pt)
  • Explorer 9 – amerykański satelita naukowy będący balonem badającym gęstość atmosfery. Ładunek ten był pierwszym pomyślnie wyniesionym przez rakietę całkowicie na paliwo stałe i pierwszym pomyślnie wyniesionym z poligonu Wallops Island. (pl)
  • Explorer 9 byla americká vědecká družice, vypuštěná v 16. února 1961. Byla to první úspěšná družice z řady nafukovacích kulovitých sond, určených k průzkumu hustoty zemské atmosféry. Předchozí družice S-56 byla stejné konstrukce, ale při kvůli poruše nosné rakety Scout nedosáhla oběžné dráhy. (cs)
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  • Explorer 9 (en)
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  • Explorer 9 (en)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/Scout_X-1_with_Explorer_9_Feb_16_1961.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Explorer_9.jpg
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