Assertion: nebula's hydrogen | /r/HasProperty | astronomer
Facets:
value: as h ii
type: OTHER
value: from old spectroscopic terminology
type: OTHER
Source sentences:
text: The distribution of ionized hydrogen (known by astronomers as H II from old spectroscopic terminology) in the parts of the Galactic interstellar medium visible from the Earth's northern hemisphere as observed with the Wisconsin Hα Mapper ( Haffner et al. 2003 ).