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As the diagram in Figure 4 shows, the stars, gas, and dust are not spread evenly throughout the disk but are concentrated into a central bar and a series of spiral arms Recent infrared observations have confirmed that the central bar is composed mostly of old yellowred stars The two main spiral arms appear to connect with the ends of the barResearchers finetune maps of our galaxy's spiral arms using data from NASA's WISE missionIt appears dark because it absorbs the light from the stars in the galaxy Galaxy Types Of Galaxies Britannica Spiral galaxy hr diagram