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Spiral galaxies are classified in terms of increasing tightness of their spiral arms as types Sa, ...

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Spiral galaxies are classified in terms of increasing tightness of their spiral arms as types Sa, ...

Spiral galaxies are classified in terms of increasing tightness of their spiral arms as types Sa, Sb, and Sc. However, many spiral galaxies are aligned edge-on to the Earth and their spiral arms cannot be seen. Which other parameter that is directly related to spiral arm tightness can be easily seen edge-on and can therefore be used to provide this classification?
A)   The overall spectral color
B)   The overall intrinsic brightness of the galaxy, or its absolute magnitude
C)   The size of the nuclear bulge
D)   The overall diameter of the galaxy

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Discovering the Universe

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Authors: Kaufmann, Comins

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