Assertion: nebula's core | /r/CapableOf | present hard surface
Facets:
value: suddenly
type: MANNER
value: to the infalling gases
type: TRANSITIVE-OBJECT
Source sentences:
text: The supernova detonation occurs when material falls in from the outer layers of the star and then rebounds off the core, which has stopped collapsing and suddenly presents a hard surface to the infalling gases.