http://www.rssboard.org/rss-specification 720 http://ecuip-xtf.lib.uchicago.edu/xtf/search?expand%3Dsubject;f1-subject%3DObservatory%20(space-based);f2-subject%3DOrbiting%20Solar%20Observatory%20(OSO) Results for your query: expand=subject;f1-subject=Observatory (space-based);f2-subject=Orbiting Solar Observatory (OSO) 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