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
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Mathematics takes us into the region of absolute necessity, to which not only the actual word, but every possible word, must conform.
America lives in the heart of every man everywhere who wishes to find a region where he will be free to work out his destiny as he chooses.
Japan would like to work with the countries of the Mekong region to create a framework to support efforts by the Mekong countries in a detailed manner, on a region-by-region basis or on a theme-by-theme basis.
Freedom of navigation in this region, through the South China Sea, is crucial for any further development in the region and it's difficult to imagine that without this freedom, there will be stability and peace in this region.
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Translations for H II region
From our Multilingual Translation Dictionary
- H II領域Japanese
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