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.
Correct Answer:
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Q22: Which of the following statements about the
Q23: Where do most dust grains form?
A)in supernovae
B)in
Q24: What evidence supports the galactic fountain model?
A)We
Q25: Which of the following statements about halo
Q26: What is the most common form of
Q28: Compared with our Sun,most stars in the
Q29: Which constellation lies in the direction toward
Q30: Which of the following statements about globular
Q31: Where does most star formation occur in
Q32: What evidence suggests that the protogalactic cloud
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