Radio Maps of Our Galaxy Show Spiral Arms Because

question 41

Multiple Choice

Radio maps of our galaxy show spiral arms because

• A) the arms have larger Doppler shifts.
• B) the gas in the spiral arms is very hot.
• C) the dust in spiral arms is denser.
• D) the gas in spiral arms is denser.
• E) the stars in the spiral arms emit most of their energy at radio wavelengths.

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