Supernovae may have triggered two mass extinctions

[RonO]

https://www.sciencedaily.com/releases/2025/03/250313130822.htm

The evidence is pretty thin, but the claim is that the Devonian and
Ordovician extinction events that occurred 372 and 445 million years
ago, respectively, may have been caused by supernovas exploding within
65 light years (20 parsecs) of our solar system.

Ron Okimoto

[erik simpson]

Post by RonO
https://www.sciencedaily.com/releases/2025/03/250313130822.htm
The evidence is pretty thin, but the claim is that the Devonian and
Ordovician extinction events that occurred 372 and 445 million years
ago, respectively, may have been caused by supernovas exploding within
65 light years (20 parsecs) of our solar system.
Ron Okimoto

There isn't any evidence of supernovae, but but the reasons for thee
extinctions aren't particularly clear. Wikipedia has a good discussion
of both. The Ordovician had at least two pulses, which makes the
supernova explanation less plausible.