Learn how astronomers determined the distribution of galaxies in the universe, in this video from NOVA Digital. In the 1980s, Dr. Margaret Geller and her colleagues measured the redshift of a thousand galaxies to determine their positions. By mapping the three-dimensional locations of galaxies in a slice of the sky, they were able to reveal their distribution pattern: thin structures of galaxies surrounding vast empty regions. Subsequent studies containing tens of thousands of galaxies also revealed this same large-scale structure of filaments and voids. This pattern is caused by the interplay of gravity and the expanding universe, which amplified ripples and holes in the density of matter in the early universe. This resource is part of the NOVA: Web-Original Collection.
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