Assertion: ii supernova | /r/HasProperty | closer than 8 parsecs
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Source sentences:
text: Recent estimates predict that a Type II supernova would have to be closer than 8 parsecs (26 light years) to destroy half of the Earth's protective ozone layer.
text: Recent estimates predict that a Type II supernova would have to be closer than eight parsecs (26 light-years) to destroy half of the Earth's ozone layer, and there are no such candidates closer than about 500 light years.