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WikiPedia: Thiên_hà_Mũ_Vành_Rộng http://www.constellation-guide.com/sombrero-galaxy... http://www.deepskyvideos.com/videos/messier/M104_s... http://www.nightskyinfo.com/archive/m104_galaxy/ http://www.space.com/15428-sombrero-galaxy-spitzer... http://www.dsi-astronomie.de/M104.htm http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsear... http://chandra.harvard.edu/photo/2007/sombrero/ //arxiv.org/abs/1610.03857 //arxiv.org/abs/astro-ph/0603160 //arxiv.org/abs/astro-ph/9704107