What analogy is used to describe the thinness of the galactic disk?
Answer
A vinyl record
To provide a tangible sense of the galactic disk's structure, the text compares it to a vinyl record. While a vinyl record appears very thin when viewed from the side, it possesses a measurable thickness. Similarly, the galactic disk, while structurally flattened and highly diffuse, is not infinitely thin and has a discernible depth, though it is incredibly thin relative to its vast diameter, exhibiting an extreme aspect ratio.
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