Concept information
Preferred term
H I regions
Definition
- A region of neutral (atomic) hydrogen in interstellar space. At least 95 percent of interstellar hydrogen is H I. It emits radio waves that are 21 cm long. (en)
Broader concept
- Nebulae (en)
Narrower concepts
- HI shells (en)
Entry terms
- HI regions (en)
Editorial note
URI
http://astrothesaurus.org/uat/693
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