| 单词 | diffuse cloud |
| 释义 | diffuse clouddiffuse cloudA small atomic (H I) cloud that has too low a column density for it to be observed visually. Diffuse clouds constitute the bulk of the cold neutral medium in the three-phase description of the interstellar medium. They are usually observed by means of absorption features, such as the sodium D lines, in the spectra of background stars. |
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