| 单词 | spiral nebula |
| 释义 | > as lemmasspiral nebula spiral nebula n. a spiral galaxy (now chiefly Historical). ΘΚΠ the world > the universe > constellation > galaxy > [noun] > spiral galaxy spiral1850 spiral nebula1850 spiral galaxy1913 1850 Ld. Rosse in Philos. Trans. (Royal Soc.) 140 505 The other spiral nebulæ discovered up to the present time are comparatively difficult to be seen. 1920 A. S. Eddington Space, Time & Gravitation x. 160 The most remote objects known are the spiral nebulae, whose distances may perhaps be of the order a million light years. 1978 J. M. Pasachoff & M. L. Kutner University Astron. xxiii. 572 Another class of objects was once known as ‘spiral nebulae’... However, these spiral nebulae are now known to be galaxies in their own right. < as lemmas |
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