| 单词 | local group |
| 释义 | > as lemmaslocal group local group n. Astronomy (a) = local cluster n. (a); (b) (also with capital initials) the cluster of galaxies to which our galaxy belongs, and which also includes the Andromeda galaxy.Sense (b) originated with Hubble (quot. 1936). The Local Group of galaxies is approx. 10 million light years across. ΘΚΠ the world > the universe > constellation > star-cluster > [noun] > local local cluster1898 local group1912 the world > the universe > constellation > galaxy > [noun] > cluster of galaxies > local local cluster1898 local group1912 supergalaxy1916 1912 Carnegie Inst. Year Bk. 174 It has been found that a number of stars in Vela probably form a local group. 1918 J. C. Kapteyn in Astrophysical Jrnl. 47 106 The B0-B5 stars are about 12 times and the B8-B9 stars about 5·7 times more numerous than in the surrounding regions. This alone proves..that we have to do with a local group which probably does not extend in depth much farther than it does laterally. 1936 E. Hubble Realm of Nebulæ vi. 125 The known members of the ‘local group’ are the galactic system with the Magellanic Clouds as its two companions; M31 with M32 and NGC 205 as its companions; M33, NGC 6822 and IC 1613. 1971 D. W. Sciama Mod. Cosmol. iii. 40 They [sc. galaxies] show considerable clustering, ranging from pairs of galaxies through clusters with fifteen or twenty members like the local group, up to clusters such as the one in Virgo containing several thousand galaxies. 2005 Sci. Amer. (U.K. ed.) May 11/1 The Milky Way is part of the Local Group of galaxies. < as lemmas |
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