H II region

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An H II region is a region of interstellar atomic hydrogen that is ionized. It is typically in a molecular cloud of partially ionized gas in which star formation has recently taken place, with a size ranging from one to hundreds of light years, and density from a few to about a million particles per cubic centimetre.

Excerpt from the Wikipedia article “H II region”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Hui Yang (University of Illinois) and NASA/ESA, Public domain, via Wikimedia Commons.