HII regions Guide, Meaning , Facts, Information and Description
H II region.HII regions are clouds of hot, ionized hydrogen (HII or H+) in the interstellar medium. Many of them surround young O and B stars and are ionized by their light. These HII regions are called Strömgren spheres.
Visually, a HII region appear as an emission nebula, but most energy is radiated in the infrared wavelengths. In radiowaves, HII is visible at the 6cm wavelength.
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