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The latest computer model of the cosmos involves 400 billion particles in a box about two thirds of the volume of the universe Back in 1970, Jim Peebles at Princeton University carried out a ground-breaking experiment. He used the new-fangled technology of computing to simulate the behaviour of a cluster of galaxies under the force of gravity. This simulation was tiny by modern standards: it involved just 300 'particles'. But it showed that comp...
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