Near-Earth supernova | Wikipedia audio article
Channel: wikipedia tts
Date: 14/06/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Near-Earth_supernova


00:00:46 1 Effects on Earth
00:01:47 2 Risk by supernova type
00:03:41 3 Past events
00:06:14 4 See also



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SUMMARY
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A near-Earth supernova is an explosion resulting from the  death of a star that occurs close enough to the Earth (roughly less than 10 to 300 parsecs (30 to 1000 light-years) away) to have noticeable effects on Earth's biosphere.
Historically, each near-Earth supernova explosion has been associated with a global warming of around 3–4 °C (5–7 °F). An estimated 20 supernovae explosions have happened within 300 pc of the Earth over the last 11 million years. Type II supernovae explosions are expected to occur in active star-forming regions, with 12 such OB associations being located within 650 pc of the Earth. At present, there are six near-Earth supernova candidates within 300 pc.