Assertion: nebula's density | /r/HasProperty | high
Facets:
value: very
type: DEGREE
value: in the core of the star
type: LOCATION
Source sentences:
text: In the core of the star, the temperature and densities are high enough to sustain nuclear fusion reactions, and the energy produced by these reactions works its way to the surface and radiates into space as heat and light.
text: Grain heating by thermal exchange is very important in supernova remnants where densities and temperatures are very high.