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For an Astronomer,what Is the "Water Hole

Question 35

Multiple Choice

For an astronomer,what is the "water hole"?


A) A range of noise-free frequencies near the 21-cm emission line of hydrogen
B) A gathering place after scientific conferences
C) A range of noise-free frequencies between the microwave emission lines of hydrogen and hydroxyl
D) A hole in the atmosphere through which a spectral signature for water can be detected

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