Near-Earth supernova
Supernova close enough to affect Earth's biosphere
Near-Earth supernova
A near-Earth supernova is an explosion resulting from the death of a star that occurs close enough to the Earth, less than roughly 10 to 300 parsecs [33 to 978 light-years] away, to have noticeable effects on its biosphere. An estimated 20 supernova explosions have happened within 300 pc of the Earth over the last 300 thousand years. Type II supernova 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 up to 14 near-Earth supernova candidates within 300 pc.
Read on Wikipedia · Image NASA, ESA, J. Hester and A. Loll (Arizona State University), Public domain
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