题目

英语翻译
Recent measurements
indicate a vast amount of diffuse H+3 and H3O+ distributed in the
Galactic center,suggesting that cosmic ray ionization rate could be 10¯15 s¯1 H ¯1,one to two orders of
magnitude higher in the Galactic center region than in the disk (Oka et al.
2005; van der Tak et al.2006).
要根据句子的意思

提问时间：2021-04-03

答案

参考Galactic disk 的定义与解释 :
The galactic disc is the plane in which the spirals,bars and discs of disc galaxies exist.Galaxy discs tend to have more gas and dust,and younger stars than galactic bulges,or galactic haloes.
The galactic disc is mainly composed of gas,dust and stars.The gas and dust component of the galactic disk is called the gaseous disk.The star component of the galactic disk is called the stellar disk.
P.S.,天文学并没有奥卡星云,Oka is one of the authors of that particular scientific paper.