Mars Express Captures Dozens of Dust Devils in Mamers Valles on July 5, 2026

On July 5, 2026, the ESA's Mars Express spacecraft captured stunning images of dozens of dust devils in Mamers Valles, a valley on Mars. These dust devils, akin to those on Earth, form as sunlight warms the Martian surface, causing air to swirl upwards and lift dust into the atmosphere. The phenomenon is not just visually striking, but also plays a crucial role in Mars' meteorological cycles.

Understanding Martian Dust Devils

Dust devils are a common sight on Mars, reaching heights of up to 8 km (5 miles) and speeds of 45 meters per second (150 feet per second). The lower gravity of Mars, which is only 38% that of Earth, allows these whirlwinds to grow significantly larger than their terrestrial counterparts. These dust devils contribute to the distribution of Martian dust, impacting the planet's climate and surface conditions.

The images were taken using the High Resolution Stereo Camera (HRSC), one of eight instruments aboard Mars Express. This camera has been mapping the Red Planet since 2003 and employs up to nine separate camera channels to capture detailed images of moving surface features, including dust devils.

Mamers Valles: A Geological Marvel

Mamers Valles is a canyon system located within the cratered northern uplands of Arabia Terra. The channels in this area stretch for approximately 1,000 km (660 miles) and measure up to 25 km (15.5 miles) in diameter and 1.2 km (0.75 miles) deep. Surrounding features include mesas, cliffs, and glaciers of water ice buried beneath layers of dust and debris.

Some channels are lined with dark material believed to be volcanic sand, potentially deposited by wind. These geological features suggest that water may have once flowed through the region, as well as lava or ice, depending on the geological period. The valley dates back to the late Noachian period, around 3.8 billion years ago, when Mars transitioned from a geologically active planet to its current cold and dry state.

The Role of Dust Devils in Mars' Meteorology

Dust devils are not merely a visual spectacle; they are integral to understanding Martian weather patterns. By redistributing dust across the surface, these phenomena influence temperature variations and atmospheric conditions. As observed in the latest images, the active dust devils in Mamers Valles highlight the ongoing geological processes on Mars.

The capability of the HRSC to detect and analyze moving dust devils allows scientists to better understand their impact on the Martian environment. As exploration continues, these insights could prove vital for future missions and our understanding of Mars' climatic history.