Assertion: nebula's shell | /r/HasProperty | nebula
Facets:
Source sentences:
text: This glowing, brightly-coloured shell of gas forms a nebula that astronomers call a 'supernova remnant'.
text: This glowing, brightly colored shell of gas forms a nebula that astronomers call a "supernova remnant.
text: At a certain stage, a considerable part of the kinetic energy of the ejecta goes to produce radiation; at this time a shell nebula is observed.