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Messier_56 Tham khảoThực đơn
Messier_56 Tham khảoLiên quan
Messier 56 Messier 5 Messier 52 Messier 86 Messier 54 Messier 59 Messier 62 Messier 66 Messier 55 Messier 68Tài liệu tham khảo
WikiPedia: Messier_56 http://simbad.u-strasbg.fr/Simbad http://gclusters.altervista.org/cluster_4.php?ggc=... http://arxiv.org/abs/astro-ph/0002118v1 http://www.seds.org/messier/m/m056.html http://server1.wikisky.org/starview?object=Messier... http://www.wikisky.org/?object=Messier+56 http://www.wikisky.org/?object=Messier+56&img_sour... http://www.wikisky.org/?object=Messier+56&img_sour... http://www.wikisky.org/?object=Messier+56&img_sour... http://www.wikisky.org/?object=Messier+56&img_sour...