The Milky Way intersects the celestial equator in the constellation Aquila and the northern hemisphere. The Milky Way draws a band with different width on the celestial sphere, which is called the Galactic band. Its widest part is 30 °, the narrowest part is only 4 ° - 5 °, and the average is about 20 °. This is just a part of the Milky way<br>
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