Multiple Choice
The primary way that we observe the atomic hydrogen that makes up most of the interstellar gas in the Milky Way is with ________.
A) radio telescopes observing at a wavelength of 21 centimeters
B) ground-based visible-light telescopes
C) space-based ultraviolet telescopes
D) X-ray telescopes
Correct Answer:
Verified
Correct Answer:
Verified
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