| 单词 | emission nebula |
| 释义 | > as lemmasemission nebula emission nebula n. Astronomy a nebula which shines with its own light, produced inside it. ΘΚΠ the world > the universe > constellation > nebula > [noun] > nebula which shines with own light emission nebula1956 1954 Physics Abstr. 57 1018/2 Two fundamental types of nebulae follow from this discussion: (1) the emission-type nebulae, consisting of atomic and ionized H, without dust, and (2) dark nebulae, with dust, consisting mainly of H2.] 1956 Austral. Jrnl. Physics 9 227 Ordinary emission nebulae emit radio waves as the result of their high electron temperature by the process of free-free transitions. 1974 Sci. Amer. Oct. 34/3 These reflection nebulas are useful for studying the properties of the interstellar dust grains, but they are distinguished from the true emission nebulas, which shine as a result of the atomic processes going on within them. 1978 J. M. Pasachoff & M. L. Kutner University Astron. xxiii. 573 The Great Nebula of Orion..is an emission nebula. < as lemmas |
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