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Astronomy · L4 · The interstellar medium: gas, dust, the 21 cm line, and extinction · flowchart

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by @openstemUpdated Astronomy
Neutral hydrogen atom(electron spin ↑↑ proton spin)Emits 21 cm photon(1420.4 MHz)Detected by radio telescopesacross the GalaxyDoppler shift revealsgas velocity at each radiusGalactic rotation curve+ spiral structure mapHyperfine spin-flip (mean time ~11 Myr)Passes through dust largely unabsorbed

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