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Cluster
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=== Astronomy === * [[Cluster (spacecraft)]], constellation of four European Space Agency spacecraft * [[Cluster II (spacecraft)]], a European Space Agency mission to study the magnetosphere * [[Asteroid cluster]], a small asteroid family * [[Galaxy cluster]], large gravitationally bound groups of galaxies, or groups of groups of galaxies * [[Supercluster]], the largest gravitationally bound objects in the universe, composed of many galaxy clusters * [[Star cluster]] ** [[Globular cluster]], a spherical collection of stars whose orbit is either partially or completely in the halo of the parent galaxy ** [[Open cluster]], a spherical collection of stars that orbits a galaxy in the galactic plane
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