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This snapshot of a state-of-the-art simulation shows the flow of gas into a fledgling galaxy. Streams of cold gas (blue) flow onto the edge of the fledgling galaxy’s disk, while shock-heated gas (red) surrounds the disk. Gas enriched in metal content (green) by supernova explosions is stripped from smaller galaxies interacting with the hot dark matter halo and the cold gas stream. Credit: B. Moore, Oscar Agertz and Romain Teyssier/University of Zurich

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