= Large-scale structure of the universe
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The \b[<large-scale structure of the universe>] is the spatial organization of matter into <dark matter halos>, <galaxy clusters>, sheets, filaments and <cosmic voids>. <Galaxy clustering> <traces> this pattern, while the underlying matter also includes material that does not shine. <Gravity> amplifies initial <linear cosmological density perturbations>, but expansion and the matter's dynamics determine which scales grow efficiently. Comparing observed statistics with models of <cosmological structure formation> turns this pattern into a test of the initial conditions and subsequent evolution.
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