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If Spiral Density Waves Were the Only Thing Producing Spiral

Question 38

Multiple Choice

If spiral density waves were the only thing producing spiral arms,what result would be expected?


A) All spiral arms would be gas- and dust-free.
B) All galaxies would have only two smooth spiral arms.
C) The Milky Way would show an irregular pattern of short arms.
D) The halo component of the Milky Way would show spiral arms as well.

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