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For questions relating to the disappearance or death of an entire species.
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What could explain why trees only have 12 rings?
12 years ago a highly advanced alien race finished creating this planet
(they may come back either welcoming the visitors or chasing them away)
Picking up the fire / extinction level events notion, … the planet - maybe the burst is not so strong or the planets magnetic field somehow blocks enough of the bursts energy or another planet / the sun itself shields the planet sufficiently)
With these extinction …