Assertion: nebula's star | /r/AtLocation | red giant phase
Facets:
value: before blowing off their outer layers
type: TEMPORAL
value: typically
type: DEGREE
value: for about a billion years
type: TEMPORAL
Source sentences:
text: These stars typically remain in the red giant phase for about a billion years before blowing off their outer layers to form planetary nebulae, while their cores transition into white dwarfs that can take several trillion years to cool down.