http://www.rssboard.org/rss-specification 720 http://ecuip-xtf.lib.uchicago.edu/xtf/search?expand%3Dsubject;f5-subject%3DOrbiting%20Solar%20Observatory%20(OSO);f4-associated-Lesson%3DX-Ray%20History Results for your query: expand=subject;f5-subject=Orbiting Solar Observatory (OSO);f4-associated-Lesson=X-Ray History Thu, 01 Jan 1970 12:00:00 GMT http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/OSO-Ball-Aerospace/OSO-Ball-Aerospace.dc.xml The objectives of the Orbiting Solar Observatory (OSO) satellite series were to perform solar physics experiments above the atmosphere during a complete solar cycle and to map the celestial sphere for direction and intensity of UV light, X-rays, and gamma radiation. The OSO-1, built by Ball Aerospace, was the first satellite to have pointed instruments and onboard tape recorders for data storage. http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/OSO-Ball-Aerospace/OSO-Ball-Aerospace.dc.xml Thu, 01 Jan 1970 12:00:00 GMT