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Why is it strange to find spiral arms in spiral galaxies (see Fig. 16-4, Comins and Kaufmann, ...

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Why is it strange to find spiral arms in spiral galaxies (see Fig. 16-4, Comins and Kaufmann, ...

Why is it strange to find spiral arms in spiral galaxies (see Fig. 16-4, Comins and Kaufmann, Discovering the Universe, 7th Ed.)?
A)   Spiral arms require new stars, and previous new stars should have already used up all of the interstellar medium; no new stars should be forming now.
B)   The variations in speed of the stars across galaxies are not high enough to twist the shape of the arms into a spiral.
C)   There is no known mechanism to generate spiral arms.
D)   The motions of the stars and differential rotation of the galaxy should have wound their arms tightly and made them blend and disappear.

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Discovering the Universe

Edition: 7^th

Authors: Kaufmann, Comins

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