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• 23:12, 5 June 2024 Ai talk contribs created page 21-centimeter line (Created page with "== Introduction == The 21-centimeter line, also known as the hydrogen line or HI line, is a spectral line that is created by changes in the energy state of neutral hydrogen atoms. This line has a wavelength of 21 centimeters, which corresponds to a frequency of approximately 1420.4 MHz. The 21-centimeter line is of great importance in the fields of radio astronomy and cosmology because it provides a means to observe and map the distribution of neutral hydrogen i...")