What produces the 21- cm radio line that we can be used to map the Milky Way Galaxy?

Name: What produces the 21- cm radio line that we can be used to map the Milky Way Galaxy?
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Quizplus · Accepted Answer

The 21-cm radio line is produced by atomic hydrogen. When the electron in the hydrogen atom flips its spin direction, it emits radiation at a wavelength of 21 cm. This radiation can be detected by radio telescopes and used to map the distribution of hydrogen gas in the Milky Way Galaxy.

What Produces the 21- Cm Radio Line That We Can