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Astrophysicists Capture Rare Planet Collision Images, Rewrite Formation Models

1/3/2026

Summary

Story summary

Astronomers captured direct images of two planetesimal collisions in the Fomalhaut system (2004, 2023).
The events challenge planetary-formation models, which predict such collisions occur about every 100,000 years.
The collisions produced bright dust clouds that were initially mistaken for planets.
Paul Kalas of UC Berkeley notes these findings affect exoplanet-detection missions and warns dust clouds can mimic planets.
The James Webb Space Telescope will analyze the evolving dust around Fomalhaut.

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Story summary

Astronomers captured direct images of two planetesimal collisions in the Fomalhaut system (2004, 2023).
The events challenge planetary-formation models, which predict such collisions occur about every 100,000 years.
The collisions produced bright dust clouds that were initially mistaken for planets.
Paul Kalas of UC Berkeley notes these findings affect exoplanet-detection missions and warns dust clouds can mimic planets.
The James Webb Space Telescope will analyze the evolving dust around Fomalhaut.