What fraction of the mass of a typical interstellar cloud is helium?
A) 50 percent
B) 2 percent
C) 10 percent
D) 25 percent
Correct Answer:
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Q18: A star cluster at a great distance
Q19: The apparent reddening of light from stars
Q20: Interstellar extinction is the
A) assimilation of interstellar
Q21: How is gas distributed in interstellar space?
A)
Q22: What is the typical mass of a
Q24: In which part of the electromagnetic spectrum
Q25: What wavelengths have astronomers used to map
Q26: What causes the characteristic blue color of
Q27: Which of these easily observed molecular species
Q28: When looking for molecular hydrogen, astronomers actually
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