A galaxy with almost no starlight but plenty of cool clouds of hydrogen gas would be best observed with a(n) ________ telescope.
A. optical (visible-light)
B. radio
C. X-ray
D. infrared
Answer: B
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A) 27 B) 11 C) 17 D) 23
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A) temperature, volume B) temperature, pressure C) pressure, volume D) volume, pressure E) volume, temperature
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a. one b. two c. three d. four e. five