Galaxy distribution: model and real data

Galaxy distribution: model and real data

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This image is part of the feature Efstathiou

Credit: DR GEORGE EFSTATHIOU/SCIENCE PHOTO LIBRARY

Caption: Galaxy distribution. Two theoretical models of how the large-scale distribution of galaxies evolved compared with the real distribution. The circle at bottom (gold) shows observed galaxies within 150 million light years of Earth. The two computer- generated models assume that most of the matter in the Universe consists of dark matter. In the cold dark matter scenario (blue) galaxies form from the collisions of small proto-galaxies. In the hot dark matter scenario (green) the first objects to form are superclusters of matter which then fragment to form galaxies. The cold dark matter model is clearly closer to the real distribution of galaxies we observe in the sky.

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Keywords: astronomy, cold dark matter, cosmology, dark matter, galaxy distribution, hot dark matter, science, space, universe

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