Assertion: ring nebula | /r/HasAspect | central stars
Facets:
value: with a continuous spectrum
type: OTHER
Source sentences:
text: A definite relation exists between the character of a nucleus and the type of its nebula: small, bright planetary nebulas have central stars of the Wolf-Rayet type; ring-like nebulas have central stars with a continuous spectrum; and large, irregular nebulas have ordinary stars of spectral class O as nuclei.