As galaxies evolve over time. the orbits of their constituent stars are expected to change in size and shape. moving stars away from their birth radius. Radial gas flows are also expected. https://www.diegojavierfares.com/mega-save-8-tall-Faux-Crystal-Beaded-Candle-Holder-Centerpiece-great-buy/
The Impacts of Bars, Spirals, and Bulge Size on Gas-phase Metallicity Gradients in MaNGA Galaxies
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