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| abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > spectral line > absorption line > interstellar line |
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| interstellar line comparison table | |||||
| Subject | has discoverer | has specie | has definition | has dicovery date | occurs in |
|---|---|---|---|---|---|
| D line | Joseph Fraunhofer | Na I | Spectral line of neutral sodium, also the strongest interstellar line. | 1814 | Sun |
| HK line | O stars |
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