評(píng)論
打印
Is that the same as density?
是不是和密度一樣？
That’s right. Both richness and density refer to the number per area.
沒(méi)錯(cuò)。豐富程度和密度指的都是每單位區(qū)域內(nèi)的數(shù)量。
Rich clusters, or dense clusters, contain a relatively high number of galaxies.
豐富的星團(tuán)或密度大的星團(tuán)包含了相對(duì)較多的星系。
And symmetry just refers to its shape?
而對(duì)稱性指的只是它的形狀？
Roughly speaking, yes.
粗略來(lái)說(shuō)的話，是的。
Whether the shape of the cluster was the same on the left side as on the right side.
指的是星團(tuán)左邊的形狀和右邊的是否一樣。
So Abell used categories like that to classify clusters on a scale: from regular to irregular.
所以Abell用了像這樣的類別對(duì)某個(gè)規(guī)模上的星團(tuán)進(jìn)行了分類：從常規(guī)的到非常規(guī)的。
A regular cluster is sphere shaped, symmetrical, and most dense in the middle,
常規(guī)的星團(tuán)是球形的、對(duì)稱的、而且在中間最密集，
the greatest number of galaxies concentrated in the middle of the cluster.
也就是說(shuō)星團(tuán)中間聚集的星系數(shù)量最大。
And irregular cluster might appear to be lopsided, asymmetrical, with a little concentration of galaxies in the center.
而非常規(guī)的星團(tuán)可能看起來(lái)不太平衡、不對(duì)稱、中間沒(méi)有什么星系聚集。
