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From Time Machine
Direct cosmological simulation of the formation of black holes and galaxies
This timelapse was shows the distribution of matter in a simulated universe on l arge scales. The computer simulation (name: BHCosmo) was carried out on the Cray XT3 at the Pittsburgh Supercomputer Center by Tiziana Di Matteo (CMU) and the visualization by Yu Feng and Rupert Croft on facilities provided by the Moore foundation in the McWilliams Center for Cosmology at CMU. The full image is 600 million light years in width and the density of matter is being shown on a false color scale, with the densest regions in yellow and the least dense in red and black. The very densest regions have formed stars, which are shown as white points. Unlike images of the real Universe seen through optical telecopes, in the simulated image it is possible to see the film entary structures that stretch through the space between galaxies. These structures contain mostly hydrogen and helium gas. The only luminous matter is in galaxies, which are much sparser. To see these, we zoom in, where small blobs of gas (in dark blue) and stars (in white) become apparent: t hese are whole galaxies. As the universe evolves from early times (it starts at an age of two hundred mil lion years after the Big Bang) the initially small fluctuations grow through the action of gravity until in the last frame (which represents the universe 7 billion years later, at redshift z=1) there are large clusters of galaxies. If you zoom in and scroll around you will see that clusters contain many small galaxies as well as large ones.
More details in: Di Matteo et al., http://arxiv.org/abs/0705.2269