The image of our galaxy in radio emission from carbon monoxide maps the distribution of molecular clouds. Which of the following would give a similar picture of our galaxy?
A) 21-cm-line radio emission from atomic hydrogen.
B) visible light, showing the edges of supernova bubbles.
C) visible light, which is closest to how the night sky appears from Earth.
D) X-rays from hot gas bubbles in the disk.
E) infrared emission from interstellar dust grains.

Question

Quizplus · Accepted Answer

Infrared emission from interstellar dust grains would give a similar picture of our galaxy as it can penetrate dust clouds and reveal the distribution of molecular clouds, similar to radio emissions from carbon monoxide.

The Image of Our Galaxy in Radio Emission from Carbon