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Renyue Cen and Jeremiah Ostriker, part of the Princeton team, used a Convex C220 in 1991 to model the interactions of dark matter, baryonic gas, ionization and radiative cooling in a volume traversing approximately 200 million light years on each side and containing 128^3 or 2 million zones. The simulation ran for 250 hours, yielding 10 gigabytes of data.
In order to navigate through all the numbers, the Princeton team shipped their data to NCSA. Here, further refinement of the calculation on a Convex C240 increased the resolution to 180^3--nearly 6 million zones--after which the data was visualized using NCSA's Cosmic Explorer. The resulting movie (see above) portrayed the emergence of galaxy clusters from cosmic gas, bursting forth at first, then slowing, eventually forming patterns of sheets and voids that resembled the structures observed on large scales.
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