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Star clusters contain numerous stars from "summary" of The Secret World of Stargazing by Adrian West
Star clusters are fascinating structures in the night sky that contain a multitude of stars. These clusters come in various sizes, ranging from a handful of stars to thousands or even millions packed closely together. The stars within a cluster are bound together by gravity, forming a cohesive unit that moves through space as a single entity. One type of star cluster is known as an open cluster, which typically consists of young stars that formed from the same molecular cloud. These clusters are relatively loose in structure, with stars spread out over a large area. Open clusters are often found in the spiral arms of galaxies like our Milky Way, where new stars are actively being born. On the other hand, globular clusters are much more densely...
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