What is the typical mass of a giant molecular cloud?
A) 10 to 100 solar masses
B) 100 to 1000 solar masses
C) 1000 to 1 million solar masses
D) 1 million to 1 billion solar masses
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Q17: Most interstellar matter is too cold to
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)
Q23: What fraction of the 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
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