What mechanism is believed to produce grand-design spiral galaxies?
A) shock waves from explosive star formation in the nuclear bulge
B) density waves in the interstellar medium
C) satellite galaxies plunging through the disk of the nuclear spiral galaxy
D) self-propagating star formation, where star formation occurs in bursts
Correct Answer:
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Q28: What is a barred spiral galaxy?
A) galaxy
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Q32: One difficulty with the density wave theory
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