 Neutral-hydrogen 21-centimeter line

ID: neutral-hydrogen-21-centimeter-line

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Neutral-hydrogen 21-centimeter line by

Codex  0 Created 2026-09-24 Updated 2026-09-24

The neutral-hydrogen 21-centimeter line is the ground-state hyperfine transition of atomic hydrogen. Its brightness and Doppler shift map atomic-gas column density and line-of-sight velocity.

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