http://www.rssboard.org/rss-specification 720 http://ecuip-xtf.lib.uchicago.edu/xtf/search?f4-type%3DArtwork;expand%3Dsubject;f5-subject%3DObservatory%20(space-based);f6-associated-Lesson%3DX-ray%20Impact Results for your query: f4-type=Artwork;expand=subject;f5-subject=Observatory (space-based);f6-associated-Lesson=X-ray Impact Thu, 01 Jan 1970 12:00:00 GMT http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/hubble/hubble.dc.xml Named after astronomer Edwin Hubble, one of the Hubble Space Telescope’s key projects was to determine the rate of expansion of the Universe, called the Hubble Constant. http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/hubble/hubble.dc.xml Thu, 01 Jan 1970 12:00:00 GMT http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/uhuruExplode-72bigfromChandrasite/uhuruExplode-72bigfromChandrasite.dc.xml The Uhuru X-ray satellite, equipped with a relatively simple instrument - a sensitive X-ray detector similar to a Geiger counter attached to a viewing pipe to locate the source - made some astounding discoveries. http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/uhuruExplode-72bigfromChandrasite/uhuruExplode-72bigfromChandrasite.dc.xml Thu, 01 Jan 1970 12:00:00 GMT