The Primary Way That We Observe the Atomic Hydrogen That

question 23

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)space- based ultraviolet telescopes
• B)X- ray telescopes
• C)ground- based visible- light telescopes
• D)radio telescopes observing at a wavelength of 21 centimeters

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