M12 (球狀星團)

外部連結
*[http://messier.seds.org/m/m012.html Messier 12, SEDS Messier pages]
*[http://gclusters.altervista.org/cluster_4.php?ggc=M+12 Messier 12, Galactic Globular Clusters Database page]
[http://www.universetoday.com/am/publish/past_globular_m12.html?822006 'Stolen' stars article at Universe Today*]
*[http://www.astrovox.gr/forum/album_pic.php?pic_id=18281 Messier 12, Amateur astrophotographer (hgg) with a Celestron 9.25"]
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