The image of our galaxy in radio emission from CO, mapping the distribution of molecular clouds, is closest to the image of our galaxy in
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 2
The Schwartzschild radius for a 12 solar mass star is
A) 4 km.
B) 15 km.
C) 36 km.
D) 100 km.
E) 3000 km.
Image of a blue whale's tail fluke with the Santa Barbara Channel Islands in the background, Au
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