These days, galaxies come in very different shapes and sizes. Cutting-edge technologies allow a detailed peek at how things looked in the Universe's early days — 'the same, but different' is the tentative message.
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Kennicutt, R. Young spirals get older. Nature 442, 753–754 (2006). https://doi.org/10.1038/442753a
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DOI: https://doi.org/10.1038/442753a