Assertion: supernova's energy | /r/HasProperty | available
Facets:
value: no longer
type: TEMPORAL
Source sentences:
text: Forming elements heavier than iron absorbs rather than produces energy, however, and, since energy is no longer available, an iron core is built up at the centre of the aging, heavyweight star.
text: The creation of such elements requires an enormous input of energy and core-collapse supernovae are one of the very few places in the Universe where such energy is available.