最終更新日：2024/07/29

(physics, astronomy) a spectral line of atomic hydrogen having a wavelength of about 21cm; used extensively in radio astronomy

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hydrogen line

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hydrogen line

noun

(physics, astronomy) a spectral line of atomic hydrogen having a wavelength of about 21cm; used extensively in radio astronomy

The hydrogen line is an important feature in astrophysics.

意味（1）

(physics, astronomy) a spectral line of atomic hydrogen having a wavelength of about 21cm; used extensively in radio astronomy