Disk

Japanese: disk
Disk

…These are all old stars, and are called Population II. On the other hand, the flat areas on both sides of the bulge (called the disk) are mainly populated with O-type and B-type blue hot stars, Cepheid variable stars, and open clusters. These are young stars, and are called Population I. …

*Some terminology explanations that mention "disk" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…これらはいずれも老齢の星で,種族IIと呼ばれているものである。一方,バルジの両側の扁平な部分(これを円盤部diskという)には,O型,B型の青色高温星,ケフェウス型変光星,散開星団などが主として分布する。これらは年齢の若い星で,種族Iと呼ばれるものである。…

※「disk」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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