http://www.rssboard.org/rss-specification 720 http://ecuip-xtf.lib.uchicago.edu/xtf/search?f4-type%3DArtwork;f5-associated-Lesson%3DX-Ray%20Science;f7-subject%3DThird%20Small%20Astronomy%20Satellite%20(SAS-3).;f6-subject%3DObservatory%20(space-based) Results for your query: f4-type=Artwork;f5-associated-Lesson=X-Ray Science;f7-subject=Third Small Astronomy Satellite (SAS-3).;f6-subject=Observatory (space-based) Thu, 01 Jan 1970 12:00:00 GMT http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/sas3/sas3.dc.xml Designed and built at M.I.T, the SAS-3 was a spinning satellite. The spin rate was controlled by a gyroscope that could be commanded to stop rotation so that all instruments could be pointed at a given source. Pointing could provide about 30 minutes of continuous data on a source, such as a pulsar, burster, or transient. This is an artist’s conception of the satellite in orbit.. http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/sas3/sas3.dc.xml Thu, 01 Jan 1970 12:00:00 GMT