http://www.rssboard.org/rss-specification 720 http://ecuip-xtf.lib.uchicago.edu/xtf/search?expand%3Dsubject;f1-subject%3DGamma%20Ray%20Burst;f2-associated-Lesson%3DX-Ray%20Science Results for your query: expand=subject;f1-subject=Gamma Ray Burst;f2-associated-Lesson=X-Ray Science Thu, 01 Jan 1970 12:00:00 GMT http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/NASA-Fermi-Map/NASA-Fermi-Map.dc.xml This all-sky image made in 2011 was constructed using two years of observations by NASA's Fermi Gamma-ray Space Telescope. It shows how the sky appears at energies greater than 1 billion electron volts (1 GeV). Brighter colors indicate brighter gamma-ray sources. A diffuse glow fills the sky and is brightest along the plane of our galaxy (middle). Discrete gamma-ray sources include pulsars and supernova remnants within our galaxy, as well as distant galaxies powered by supermassive black holes. http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/NASA-Fermi-Map/NASA-Fermi-Map.dc.xml Thu, 01 Jan 1970 12:00:00 GMT