Explorer 9
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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 , balloon which was deployed into a medium Earth orbit. The mission was conducted by NASA's Langley Research Center.
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 , balloon which was deployed into a medium Earth orbit. The mission was conducted by NASA's Langley Research Center.
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