Assertion: nebula's core | /r/AtLocation | the form of a white dwarf
Facets:
value: behind
type: LOCATION
Source sentences:
text: Eventually the core heats up enough to begin fusing helium, when the helium runs out the star becomes unstable and its outer layers are ejected leaving only the core remaining in the form of a white dwarf.
text: Our Sun will produce a planetary nebula and its core will remain behind in the form of a white dwarf.