What fraction of the mass of a typical interstellar cloud is helium?
A) 50%
B) 2%
C) 10%
D) 25%
Correct Answer:
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Q20: Dark nebulae are extreme examples of:
A) interstellar
Q21: In star-forming regions in interstellar space,which molecule
Q22: How is gas distributed in interstellar space?
A)
Q23: When looking for molecular hydrogen,astronomers actually look
Q24: Which important atomic or molecular species is
Q25: What wavelengths have astronomers used to map
Q26: What are the typical dimensions of a
Q28: The density of carbon monoxide is observed
Q29: What is a typical size for a
Q30: The mass of a particular interstellar giant
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