The H I regions are mapped by the radiation created when an electron flips its spin.

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This is known as the 21 cm line emission, which occurs when a hydrogen atom's electron flips its spin from parallel to antiparallel with the hydrogen nucleus. This results in the emission of a radio wave with a wavelength of 21 centimeters, which can be used to map the distribution of neutral hydrogen gas in interstellar space. The radiation created when an electron flips its spin is known as 21 cm radiation, which is used to map H I regions.

The H I Regions Are Mapped by the Radiation Created