The Universe is permeated by filaments of invisible dark matter that intersect at galaxies and other major structures. This is the conclusion of astronomers from the Cosmic Evolution Survey (COSMOS), who have created the first large-scale map of the distribution of dark matter. The apparent overlap of dark matter filaments with galaxies and other massive structures adds further weight to the theory that the Universe owes its structure to the gravitational pull of dark matter (Nature doi:10.1038/nature05497).
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