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Messier 13 is a globular cluster made up of roughly half a million stars, notice how when you look at the full image (done so by clicking the image) that you can see different color stars within the cluster.
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Messier 13 is a globular cluster made up of roughly half a million stars, notice how when you look at the full image (done so by clicking the image) that you can see different color stars within the cluster.