alt label |
|
||||||
---|---|---|---|---|---|---|---|
dcterms modified | ![]() ![]() |
||||||
broader |
|
||||||
definition | A theoretical sphere of ionized hydrogen created by energetic ultraviolet photons of a hot, massive star embedded in a uniform interstellar molecular cloud and lying at the center of the sphere. | ||||||
type |
|
||||||
contributor | AAS_Frey.Katie_Admin original |