Assertion: nebula's shell | /r/HasProperty | dusty
Facets:
Source sentences:
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.
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.