One asteroid strike may explain two mysteries of Mars’ moon Deimos

A single asteroid impact may explain two of Deimos’s most puzzling features: its huge southern depression and unusually smooth, dusty surface. Simulations suggest a roughly 320-meter asteroid struck the Martian moon at an angle, throwing debris around the entire world without breaking it apart. New observations from ESA’s Hera spacecraft support the scenario and indicate that Deimos is surprisingly porous and fragile.

One asteroid strike may explain two mysteries of Mars’ moon Deimos. One asteroid strike may explain two mysteries of Mars’ moon Deimos | Science News from research organizations One asteroid strike may explain two mysteries of Mars’ moon Deimos Date: August 26, 2026 Source: University of Bern Summary: A single asteroid impact may explain two of Deimos’s most puzzling features: its huge southern depression and unusually smooth, dusty surface. Share: Facebook Twitter Pinterest LinkedIN Email FULL STORY One ancient asteroid impact may have reshaped nearly the entire surface of Mars’ mysterious moon Deimos.

Credit: NASA/JPL-Caltech/University of Arizona An international team led by the University of Bern has found evidence that a single asteroid collision may have dramatically reshaped Deimos, the smaller of Mars’ two moons. By combining detailed computer simulations with recent images from ESA’s Hera spacecraft, the researchers concluded that one impact could account for both the moon’s large southern depression and its unusually smooth, dusty surface. The research is the first scientific study to incorporate observations collected during Hera’s flyby of Deimos.

The findings could also help guide future missions, including the Japan Aerospace Exploration Agency (JAXA) Martian Moons eXploration (MMX) mission.