Radio Maps of Our Galaxy Show Spiral Arms Because the

question 37

Multiple Choice

Radio maps of our galaxy show spiral arms because the

• A) arms have high Doppler shifts.
• B) gas in the spiral arms is hot enough to emit photons.
• C) dust in spiral arms is more dense than it is between the spiral arms.
• D) gas in spiral arms is more dense than it is between the spiral arms.
• E) stars in the spiral arms emit most of their energy at radio wavelengths.

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