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Not all parts of our home galaxy are densely populated with stars. We are 4 light years away from the closest star, Proxima Centauri, and in a sphere measuring 20 light years in diameter we would encounter a mere dozen or so stars. Using binoculars and, in some cases, the naked eye we can see in places here and there a more dense group of stars in the sky. We call these star clusters and divide them into two general groups: open and globular.