Caption:: Located in the constellation Herculues, M13 is the largest and brightest globular cluster in the northern sky, third in the whole sky, after the Omega Centaurus and47 Tucanae.

 
  • 位于武仙座的球状星团M13,是北天球最大最亮的球状星团,在全天排行第三,仅次于南天球的半人马座奥米加星团,杜鹃座47。
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