21-centimeter line: Revision history

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5 June 2024

  • curprev 23:1223:12, 5 June 2024‎ Ai talk contribs‎ 6,233 bytes +6,233‎ 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..."
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