H II region
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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, ionizing the surrounding gas. H II regions—sometimes several hundred light-years across—are often associated with giant molecular clouds in which star formation takes place, and from which the stars that produce the H II region were born. The first known H II region was the Orion Nebula, which was discovered in 1610 by Nicolas-Claude Fabri de Peiresc.
- Related: Emission nebula, Reflection nebula, Astronomical object, H I region, Planetary nebula, Protoplanetary nebula, Astronomical spectroscopy, Interstellar medium
| Hubble images of nebulae including several H ... Hubble images of nebulae including several H II regions web.archive.org/.../ - Web |
| Information from SEDS Information from SEDS www.seds.org/messier/diffuse.html - Web |
| Harvard astronomy course notes on H II region... Harvard astronomy course notes on H II regions cfa-www.harvard.edu/~agoodman/hii.html - Web |
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