H II region(Noun)
A large nebula of gas and plasma of glowing low density in which star formation has recently taken place.
H II region
An H II region is a large, low-density cloud of partially ionized gas in which star formation has recently taken place. The short-lived, blue stars forged in these regions emit copious amounts of ultraviolet light, that ionize the surrounding gas. H II regions—sometimes several hundred light-years across—are often associated with giant molecular clouds. The first known H II region was the Orion Nebula, which was discovered in 1610 by Nicolas-Claude Fabri de Peiresc. H II regions are named for the large amount of ionised atomic hydrogen they contain, referred to as H II, pronounced H-two by astronomers. Such regions have extremely diverse shapes, because the distribution of the stars and gas inside them is irregular. They often appear clumpy and filamentary, sometimes showing bizarre shapes such as the Horsehead Nebula. H II regions may give birth to thousands of stars over a period of several million years. In the end, supernova explosions and strong stellar winds from the most massive stars in the resulting star cluster will disperse the gases of the H II region, leaving behind a cluster of birthed stars such as the Pleiades.
The numerical value of h ii region in Chaldean Numerology is: 3
The numerical value of h ii region in Pythagorean Numerology is: 4
Sample Sentences & Example Usage
It is a crisis in the region.
The region is awash in weapons.
This region will definitely go extinct.
The whole region is used to being lifted by this company.
We always navigate in a very constructive way in the region.
Images & Illustrations of h ii region
Translations for h ii region
From our Multilingual Translation Dictionary
- H II領域Japanese
Get even more translations for h ii region »
Find a translation for the h ii region definition in other languages:
Select another language:
Discuss these h ii region definitions with the community:
Word of the Day
Would you like us to send you a FREE new word definition delivered to your inbox daily?
Use the citation below to add this definition to your bibliography:
"h ii region." Definitions.net. STANDS4 LLC, 2018. Web. 26 Apr. 2018. <https://www.definitions.net/definition/h ii region>.