H I Region

Details H I Region H I Region

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke5277.&link_type=abstract

"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 5277. Bristol: Institute of Physics Publishing, 2001

Astronomy and Astrophysics

Astrophysics

Interstellar Medium, Interstellar Medium Models And Concepts

Scientific paper

A cloud of interstellar matter consisting predominantly of neutral hydrogen atoms. `Neutral' means not ionized—each hydrogen atom consists of a proton and its lone electron; this is what is implied by `H I' (pronounced `H one'). In H II (`H two') regions, the hydrogen is ionized, each atom having lost its electron. In mass and volume, neutral hydrogen accounts for about half of all interstellar m...

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