Assertion: nebula's shell | /r/Synonym | planetary nebula
Facets:
Source sentences:
text: After that, the surviving pair of white dwarfs will illuminate a shell of gas called a planetary nebula.
text: After that, the surviving pair of white dwarfs will illuminate a shell of gas called a planetary nebula.
text: After that, the surviving pair of white dwarfs will illuminate a shell of gas called a planetary nebula.