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Date: 2012-01-13 10:57:58Physical cosmology Astrophysics Observational astronomy Local Group Spiral galaxies Astronomy Now Martin Mobberley Celestia Galaxy Astronomy Physics Space | [01] Cover Jan09 version 2.inddAdd to Reading ListSource URL: astronomynow.comDownload Document from Source WebsiteFile Size: 1,59 MBShare Document on Facebook |