Assertion: celestial sphere's star | /r/CapableOf | expel their outer layers
Facets:
value: as planetary nebulae
type: MANNER
Source sentences:
text: White dwarfs are dense remnants of stars that expelled their outer layers when they reached the end of their life cycle.
text: Instead, when they reach the end of their life cycle, the stars will expel their outer layers as planetary nebulae, leaving behind planet-sized white dwarfs, much like the companions of Sirius and Procyon, that will gradually fade.