Assertion: supernova | /r/HasProperty | a once
Facets:
value: in a lifetime spectacle
type: OTHER
Source sentences:
text: A supernova within our galaxy is a once in a lifetime spectacle.
text: A supernova within our galaxy is a once in a lifetime spectacle.
text: A supernova within our galaxy is a once in a lifetime spectacle', tweeted physics teacher Dr David Boyce.