An H II region is a region of interstellar atomic hydrogen that is ionized. [1] It is typically in a molecular cloud of partially ionized gas in which star formation has recently taken place, with a …

H II region, interstellar matter consisting of ionized hydrogen atoms. The energy that is responsible for ionizing and heating the hydrogen in an emission nebula comes from a central …

The H-II (H2) rocket was a Japanese satellite launch system, which flew seven times between 1994 and 1999, with five successes. It was developed by NASDA in order to give Japan a …

电离氢区 （H II區）是發光的 氣體 和 電漿 組成的雲氣，有時會有數百 光年 的直徑，是 恆星 誕生的場所。 從這些氣體中誕生的 年輕、炙熱的藍色恆星 散發出大量的 紫外線，使 星雲 環繞在 …

电离氢区也叫HII区，它们是以氢为主要成分的星际气体云。 若星云附近有比较年轻的炽热恒星，则本来是中性的氢（中性氢区也叫HI区）会被恒星的紫外辐射电离，形成电离氢区——这样 …

H II regions are clouds of ionized gas surrounding O stars, associated with molecular clouds. The gas is ionized by ultraviolet light from these massive young stars, recently formed from …

h-ii运载火箭（ h-ii ）是日本的卫星发射运载器，在1994年至1999年间发射了七次，成功五次。 由 NASDA （ 日语 ： 宇宙開発事業団 ） 研发，用于满足日本1990年代发射大型卫星的需要。

Areas in space which are luminous with the emission spectrum of ionized hydrogen are called H II regions. They are associated with the presence of massive O-type and B-type stars. Such …

The H-II launch vehicle, the central rocket in Japan's space program, with the capability to launch a two-ton class satellite into geostationary orbit, is a two-stage rocket that was developed with …

2017年6月20日 · We present a tutorial on the determination of the physical conditions and chemical abundances in gaseous nebulae. We also include a brief review of recent results on …