请输入您要查询的字词:

 

单词 galaxy cluster
释义 galaxy cluster
A group of galaxies containing many hundreds of members extending over a radius of up to a few megaparsecs (there also exist small groups of galaxies, such as the Local Group, with a few tens of members). The richest and most regular clusters, such as the Coma cluster , with thousands of members, are gravitationally bound systems; it is not certain whether other less regular and less concentrated clusters are also bound. As well as galaxies, the clusters contain hot intracluster gas , at temperatures between 107 and 108 K; this can be detected by its X-ray emission. On a scale larger than clusters there are also superclusters , with extents of the order of a hundred megaparsecs, containing about a hundred galaxies. It is not known whether superclusters are gravitationally bound. See also missing mass
随便看

 

物理辞典收录了3346条物理词条,基本涵盖了常用物理知识及物理英语单词词组的翻译及用法,是物理学习的有利工具。

 

Copyright © 2000-2023 Newdu.com.com All Rights Reserved
更新时间:2025/6/23 4:35:09