Assertion: nebula's star | /r/CapableOf | begin puffing away layers of material
Facets:
Source sentences:
text: A star can become a planetary nebula after it depletes its nuclear fuel - hydrogen and helium - and begins puffing away layers of material.
text: A star can become a planetary nebula after it depletes its nuclear fuel - hydrogen and helium - and begins puffing away layers of material.