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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