“Abell richness classes”的概念、定义、翻译、参考文献-科学参考

单词	Abell richness classes
释义	Abell richness classes [`ā·bǝl `rich·nǝs ´klas·ǝz] ^ASTRONOMY A scale of six categories of richness into which clusters of galaxies are classified, based on the number of galaxies observed in the cluster that are not more than 2 magnitudes fainter than the third-brightest member.
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