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Are galactic spiral arms traffic jams or do they wind up? The evidence is… polarizing.

19 Dec 2019, 14:00 UTC
Are galactic spiral arms traffic jams or do they wind up? The evidence is… polarizing. NASA/SOFIA; NASA/JPL-Caltech/Roma Tre Univ.

Why do spiral galaxies have spiral arms? This is a question that I figured had been solved decades ago.

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