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Messier 29 Messier 2 Messier 95 Messier 92 Messier 99 Messier 89 Messier 39 Messier 9 Messier 59 Messier 98Tài liệu tham khảo
WikiPedia: Messier_29 http://www.deepskyvideos.com/videos/messier/M29.ht... http://simbad.u-strasbg.fr/Simbad http://www.perseus.gr/Astro-DSO-NGC-6913.htm http://messier.seds.org/m/m029.html http://server1.wikisky.org/starview?object=Messier... http://www.wikisky.org/?object=Messier+29 http://www.wikisky.org/?object=Messier+29&img_sour... http://www.wikisky.org/?object=Messier+29&img_sour... http://www.wikisky.org/?object=Messier+29&img_sour... http://www.wikisky.org/?object=Messier+29&img_sour...