The Universe is everything we can touch, feel, sense, measure or detect. It includes living things, planets, stars, galaxies, dust clouds, light, and even time. ... The Universe contains billions of galaxies, each containing millions or even trillio...
Some stars are in groups called clusters. Open clusters are loose groups of young stars that were born around the same time in a nebula and not bound to each other very strongly. Old stars can be bound together very strongly by gravity into tight spheres called globular clusters.
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Omega Centauri
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Pleiades
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Jewel Box
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