Este fue
tu cielo.

M13: The Great Globular Cluster in Hercules

M13 is modestly recognized as the Great Globular Cluster in Hercules. A system of stars numbering in the hundreds of thousands, it is one of the brightest globular star clusters in the northern sky. At a distance of 25,000 light-years, the cluster stars crowd into a region 150 light-years in diameter. Approaching the cluster core, over 100 stars would be contained in a cube just 3 light-years on a side.