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![The helical model - our Galaxy is a vortex](https://cdn-ak-scissors.b.st-hatena.com/image/square/a8e3c6b4f6112e20c255ad54c3910942ff458fdd/height=288;version=1;width=512/https%3A%2F%2Fi.ytimg.com%2Fvi%2FC4V-ooITrws%2Fhqdefault.jpg)