Assertion: ia supernova | /r/HasProperty | closer than 1000 parsecs
Facets:
Source sentences:
text: One theory suggests that a Type Ia supernova would have to be closer than 1000 parsecs (3300 light years) to affect the Earth.
text: Ia supernova would have to be closer than 1,000 parsecs (3,300 light-years) to cause significant damage to the ozone layer, and perhaps closer than 500 parsecs.