Assertion: supernova | /r/HasProperty | detected
Facets:
Source sentences:
text: Hubble launched in 1990, just three years after the supernova was detected, so Hubble has a long history of observations.
text: If such a collision occurred between 10 and 200 years before the supernova was detected, the two stars could have released a gassy envelope that lingered around the system as the stars merged over the following century.