Why Do the Spiral Arms Show Up So Clearly in Spiral

question 48

Multiple Choice

Why do the spiral arms show up so clearly in spiral galaxies?

• A) Stars are spread uniformly over the galaxy but the dust forms a spiral pattern,absorbing starlight;the spiral arms are the dust-free regions between the dust lanes.
• B) Stars are spread almost uniformly throughout the disk of the galaxy outside the nuclear bulge,but the brightest stars occur only in the spiral arms,making the arms stand out.
• C) There are many more stars in the arms than in the regions between the arms,so the arms stand out distinctly.
• D) Stars occur only in the spiral arms (and the nuclear bulge),with essentially none between the arms,making the arms stand out brightly.

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