http://www.rssboard.org/rss-specification 720 http://ecuip-xtf.lib.uchicago.edu/xtf/search?expand%3Dsubject;f1-spectral-Type%3DX-ray;f2-subject%3DGalaxy Results for your query: expand=subject;f1-spectral-Type=X-ray;f2-subject=Galaxy Thu, 01 Jan 1970 12:00:00 GMT http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/m31einstein/m31einstein.dc.xml This picture taken by the Einstein Observatory points to the galactic center of M31 - the Andromeda Galaxy - the nearest spiral galaxy to our Milky Way galaxy. Using more than 150 observations carried out over 13 years by the Chandra X-ray Observatory, researchers in 2013 identified 26 black hole candidates, the largest number to date, in the Andromeda Galaxy. http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/m31einstein/m31einstein.dc.xml Thu, 01 Jan 1970 12:00:00 GMT