| 单词 | dwarf galaxy |
| 释义 | > as lemmasdwarf galaxy dwarf galaxy n. Astronomy a galaxy of relatively low luminosity and size.Dwarf galaxies are the most abundant type of galaxy. They typically contain fewer than 40 billion stars (and often fewer than a billion). The smallest ultra-faint dwarf galaxies may contain only a few tens of stars. ΚΠ 1928 W. J. L. Luyten Pageant of Stars 267 We might well consider them as dwarf galaxies. 1960 S. van den Bergh in Astrophysical Jrnl. 131 216 The nomenclature for the luminosity classes has been chosen to agree with that used in the Yerkes system of stellar luminosity classification: (I) supergiant galaxy, (II) bright giant galaxy, (III) normal giant galaxy, (IV) subgiant galaxy, and (V) dwarf galaxy. 2015 Sci. Amer. (U.K. ed.) Nov. 37/1 The experiment has made some interesting astrophysical findings, such as the discovery of 16 ultrafaint dwarf galaxy candidates in the Milky Way's backyard. < as lemmas |
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