Assertion: tungsten | /r/HasProperty | formed
Facets:
value: during a supernova
type: TEMPORAL
value: from the explosions of massive stars
type: OTHER
Source sentences:
text: Instead, tungsten is thought to be formed from the explosions of massive stars.
text: It is believed to be formed during a supernova and, as supernova explosions happen rarely, it is a relatively rare metal element.