Even the smallest details of the Martian landscape can hide incredible phenomena. It turns out that dust whirlwinds, also known as “dust devils” on the Red Planet, move at incredible speeds that significantly exceed scientists’ previous estimates.

A camera aboard ESA’s ExoMars Trace Gas Orbiter captured three dust devils moving across the surface of Mars.
Image: ESA/TGO/CaSSIS

Researchers from the University of Bern in Switzerland analyzed archives of images from the European Space Agency’s Mars Express and Trace Gas Orbiter spacecraft. Using artificial intelligence models, they were able to track more than a thousand dust devils recorded over the past two decades. 

The result is impressive: these whirlwinds can reach speeds of up to 158 km/h, making them much more powerful than previously thought. This discovery radically changes our understanding of the dynamics of the Martian atmosphere.

Turning artifacts into scientific data

The most ingenious aspect of this study was the method. None of the orbital vehicles were specifically designed to measure wind. However, the team found a way. They noticed slight color shifts in the images caused by split-second delays between the camera channels. These shifts are usually considered technical noise. But everything that moves across the surface of Mars — clouds or dust whirlwinds — leaves its mark in these shifts. By analyzing these tiny shifts between frames, scientists were able to calculate the speed and direction of each whirlwind.

Dust devil on the surface of Mars.
Photo: ESA

As research leader Valentin Bickel noted, they literally “turned image artifacts into valuable scientific measurements.” 

This fundamental discovery has direct practical significance for the exploration of Mars. A dust devil is a kind of visualizer of invisible wind. By measuring it, we obtain a map of winds across the entire surface of the planet.

Animation of the movement of the “dust devil” on Mars

This information will be invaluable for planning future landings. Scientists will be able to more accurately assess wind conditions at the landing site, predict how much dust will settle on the rovers’ solar panels, and determine the optimal frequency of self-cleaning to maintain viability. 

Rhythms of Martian weather

The new catalog also confirms that dust devils have their “favorite” places and times. They most often occur on dust plains such as Amazonis Planitia during the warm seasons of spring and summer. Their activity peaks between late morning and early afternoon, which is very similar to patterns on Earth.

Map showing 1,039 dust devils detected on Mars, recorded over a period of 20 years by ESA’s Mars Express and ExoMars Trace Gas Orbiter.
Image: ESA/TGO/CaSSIS

However, there is a key difference on Mars. Since no rain falls there, dust can remain in the atmosphere for months. Understanding how and when it enters the atmosphere is key to unraveling the planet’s long-term climate cycles and accurately predicting Martian weather. As ESA scientist Colin Wilson noted: “Dust on Mars affects absolutely everything.” 

Earlier, we reported on how robots on Mars would quickly turn into scrap metal.

  • According to ESA