Orbiting Solar Observatory

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Dr. Nancy Roman, with a model of the Orbiting Solar Observatory.
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Dr. Nancy Roman, with a model of the Orbiting Solar Observatory.
The OSO 4 satellite.
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The OSO 4 satellite.
A Delta rocket launching OSO 8 on June 21,1975, at Cape Canaveral.
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A Delta rocket launching OSO 8 on June 21,1975, at Cape Canaveral.

The Orbiting Solar Observatory (abbreviated OSO) was the name of a series of nine NASA satellites to study the sun, of which eight were launched successfully between 1962 and 1975 using Delta rockets. Their primary mission was to observe an 11-year sun spot cycle in UV and X-ray spectra.

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