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Ancient Asteroid Impact Reveals Lifelong Hydrothermal Ecosystems

9/18/2025

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Summary

Story summary

Researchers from Linnaeus University examined the Lappajärvi impact structure in Finland, created 78 million years ago by a 1.6 km asteroid.
They discovered that microbial life began colonizing the hydrothermal system beneath the crater approximately five million years after the impact.
Additional signs of microbial activity emerged ten million years later.
Minerals like 34S-depleted pyrite and calcite served as biosignatures of ancient life.
The study indicates that meteorite impacts can establish enduring hydrothermal systems that support life.

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Story summary

Researchers from Linnaeus University examined the Lappajärvi impact structure in Finland, created 78 million years ago by a 1.6 km asteroid.
They discovered that microbial life began colonizing the hydrothermal system beneath the crater approximately five million years after the impact.
Additional signs of microbial activity emerged ten million years later.
Minerals like 34S-depleted pyrite and calcite served as biosignatures of ancient life.
The study indicates that meteorite impacts can establish enduring hydrothermal systems that support life.