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An open cluster, also known as galactic cluster, is a group of up to a few thousand stars that were formed from the same giant molecular cloud and have roughly the same age.he nearest open cluster is the Hyades: the stellar association consisting of most of the Plough stars is at about half the distance of the Hyades, but is a stellar association rather than an open cluster as the stars are not gravitationally bound to each other.
Alpha Centauri is the closest star to our solar system, at about 4.2 Light Years.. It's not a solar system in the sense that ours is though - it's a triple star system composed of Alpha Centauri A (a little bigger than the Sun), Alpha Centauri B (a little smaller than the Sun) and Proxima Centauri (a red dwarf - very small star).