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) ground-based visible-light telescopes.
B) space-based ultraviolet telescopes.
C) X-ray telescopes.
D) radio telescopes observing at a wavelength of 21 centimeters.
Correct Answer:
Verified
Correct Answer:
Verified
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