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Observable Predictions Spiral arm spacing and pitch angle should follow phase wave harmonics, not mass distribution. Bars are stable field bottlenecks, long-lived regardless of stellar content. Clusters found in arms are coherence resonance nodes No gravitational binding between arms and clusters

These are three known bulk 'moving groups' of stars, but this is the first time (I think) that clusters have been connected to them with orbit integration. They suggest in the paper that resonances between stars and the Milky Way's spiral arms / bar are responsible for these groups. ☄️🧪 #galactic