Planetary EcologistNear-Earth supernova (Earth π)
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 away, to have noticeable effects on its biosphere. An estimated 20 supernova explosions have happened within 300 pc of the Earth over the last 11 million years. Type II supernova explosions are ...
https://en.wikipedia.org/wiki/Near-Earth_supernova
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