Assertion: eye nebula | /r/CapableOf | start forming inside dusty shells
Facets:
Source sentences:
text: Approximately 1,000 years ago the pattern of mass loss suddenly changed, and the Cat's Eye Nebula started forming inside the dusty shells.
text: Approximately 1,000 years ago the pattern of mass loss suddenly changed, and the Cat's Eye Nebula began forming inside the dusty shells.
text: Approximately 1,000 years ago the pattern of mass loss suddenly changed, and the Cat's Eye Nebula started forming inside the dusty shells.