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Related Experiment Video

Updated: Jan 8, 2026

Laboratory Drop Towers for the Experimental Simulation of Dust-aggregate Collisions in the Early Solar System

Laboratory Drop Towers for the Experimental Simulation of Dust-aggregate Collisions in the Early Solar System

Published on: June 5, 2014

A second planetesimal collision in the Fomalhaut system.

Paul Kalas^1,2,3, Jason J Wang^4,5, Maxwell A Millar-Blanchaer⁶

¹Astronomy Department, University of California, Berkeley, Berkeley, CA, USA.

Science (New York, N.Y.)

|December 18, 2025

Summary

Astronomers observed a new dust cloud around the star Fomalhaut, likely from a recent planetesimal collision. This discovery offers insights into the dynamics of debris belts and rare impact events.

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Area of Science:

Astronomy and Astrophysics
Exoplanetary Science
Planetary Dynamics

Background:

Fomalhaut b, a compact source orbiting the star Fomalhaut, has been debated as either a dust-enshrouded exoplanet or a debris cloud from planetesimal collisions.
Collisional events in planetary systems are rarely observed directly, but their resulting dust can be detected via imaging.

Purpose of the Study:

To investigate the nature of compact sources around Fomalhaut.
To analyze the dynamics of debris within Fomalhaut's system.
To provide observational evidence for planetesimal collisions.

Main Methods:

Utilizing Hubble Space Telescope observations.
Analyzing direct imaging data of the Fomalhaut system.
Tracking the position and motion of dust sources over a twenty-year period.

Main Results:

A second point source, similar to Fomalhaut b, appeared in 2023 Hubble Space Telescope observations.
This new source is interpreted as a dust cloud resulting from a recent impact between two planetesimals.
The observed motion of two impact-generated dust clouds over two decades offers constraints on collisional dynamics.

Conclusions:

The appearance of a second impact-generated dust cloud supports the hypothesis of ongoing collisions in the Fomalhaut debris belt.
These observations provide rare, direct evidence of planetesimal collisions and their resulting debris.
The study enhances our understanding of the dynamics and evolution of debris disks around young stars.