Assertion: ii supernova | /r/CapableOf | show broad emission lines
Facets:
value: very
type: DEGREE
Source sentences:
text: While most Type II supernova show very broad emission lines which indicate expansion velocities of many thousands of km/s, some have relatively narrow features which may be produced by the interaction of the ejecta with circumstellar material; these are called Type IIn, where the "n" stands for "narrow".