Why Is 21-Cm Radiation the Best Way to Map the Spiral

question 9

Multiple Choice

Why is 21-cm radiation the best way to map the spiral arms in the Milky Way?

• A) The molecular hydrogen gas that produces this emission is concentrated in the spiral arms.
• B) These photons, which are produced by neutral hydrogen, pass through the dense clouds of gas and dust in the disk.
• C) The emission is produced by supernovae, which are concentrated in the spiral arms.
• D) Radio telescopes are easier to operate than optical telescopes, and observations can be made even during the daytime.
• E) Radio photons do not have Doppler shifts, so we can detect clouds of gas without having to worry about the orbital velocities.

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