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Answer :
Final answer:
Density waves in the galaxy cause stars and gas to clump together, forming the somewhat flocculent, somewhat grand design spiral arms of the Milky Way. These waves maintain a consistent shape, even though individual stars move in and out of them, similar to a traffic jam with moving cars.
Explanation:
Astronomers believe that the density waves are responsible for the somewhat flocculent, somewhat grand design spiral arms of the Milky Way Galaxy. These density waves are regions of increased density of matter that move through the galaxy and cause stars and gas to clump together. The density waves result in noticeable spiral arms due to the increased density of matter and the subsequent star formation that occurs in these regions.
To visualize this, imagine a traffic jam on a highway. Even though individual cars (like stars in the galaxy) are moving in and out of the jam, the jam itself (analogous to the density wave) stays in the same place. Thus, while individual stars move in and out of the Milky Way's spiral arms, the arms themselves maintain their shape due to the density waves.
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