Dark Ranger (TM) Postcard - Hercules Globular Cluster (M13)
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Once in a blue moon astronomers name things well (e.g., stars clustered in globs are called globular clusters). Big ones like M13 have 1/2-million stars so densely packed that the distances between stars are measured in light-weeks, instead of light years. Since these globs are almost as old as the Universe, all their massive stars died billions of years ago. The remaining stars, being smaller than our Sun, age very slowly. Yet, occasionally they collide, becoming bigger "blue stragglers
