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#A3-DmodelofMilkyWayGalaxy  Comparison of simulation of three main star forming episodes in the spiral arms with the currently observed Cepheid variables. Oldest stars (red) are 400 million years old and the youngest (blue) are 30 million years old. Top view of the Milky Way, simulations are shown in the left panel, observations – in the right panel. Credit: J. Skowron / OGLE / Astronomical Observatory, University of Warsaw
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