A dark feature in Mars’ Utopia Planitia region has expanded considerably since its initial photographic capture in 1976. Researchers have a general idea of its nature but cannot fully account for its gradual enlargement.
A region of Mars’ Utopia Planitia covered in dark volcanic deposits is gradually encroaching upon the Red Planet’s terrain. Experts are uncertain about the reasons for this phenomenon.(Image credit: ESA/DLR/FU Berlin)Sign up for our newsletter
A vast dark area within a large Martian crater has been advancing across the Red Planet’s surface since it was initially observed approximately 50 years ago, according to recent imagery, and scientists are uncertain about the precise cause of this development.
The dimly lit formation consists of ground covered by ash and volcanic rocks, such as olivine and pyroxene, originating from ancient eruptions that occurred millennia ago, predating Mars’ perceived geological inactivity. It is situated in Utopia Planitia, a plain in Mars’ northern hemisphere measuring approximately 2,000 miles (3,300 kilometers) in diameter.
The extent of this shadowed feature is not precisely known. However, based on the most recent images from ESA, portions of the patch’s southern edge have migrated southward by at least 200 miles (320 km). This implies that the dark terrain has been expanding at a rate of roughly 4 miles (6.5 km) per year.
Scientists are largely convinced that the movement of the dark patch is linked to Martian winds, which are known for their ability to erode surfaces and carry ash and dust.
Aerial images demonstrate the significant expansion of the dark patch since 1976. The white rectangle indicates the area detailed by ESA’s Mars Express orbiter in 2024 (shown at the top of this article). (Image credit: NASA)
“The dispersion of the ash over the past five decades can be attributed to two potential factors: either it has been transported by Martian winds, or the reddish-brown dust that previously obscured the dark ash has been removed by wind action,” stated ESA representatives.
However, there is currently no definitive evidence to support either hypothesis, they added.
Utopia Planitia
Utopia Planitia is among the largest and most level plains on Mars. The smallest white box approximates the location of its dark “shadow.” (Image credit: NASA/USGS; ESA/DLR/FU Berlin)
This area of Mars has garnered significant scientific interest over the last fifty years. In 1976, the Viking 2 lander touched down in Utopia Planitia and conducted a series of “biological experiments” until its operational end in 1980.
More recently, China’s Zhurong rover also landed in this region in 2021 and explored the vast plain before ceasing communication in 2023. Chinese researchers have subsequently utilized the Zhurong data to suggest that Utopia Planitia was likely once submerged beneath one of Mars’ most extensive oceans, even charting what they believe to be a former coastline. The rover may have also identified indicators of a notable “climatic shift” in the region approximately 400,000 years ago.
Utopia Planitia contains several large ground fissures, known as grabens, which are among Mars’ most distinctive geological features and could offer insights into any past tectonic activity that affected the Red Planet, according to ESA.
Furthermore, researchers theorize that substantial quantities of subsurface ice exist beneath the region, which could hold significant implications for the ongoing search for extraterrestrial life.
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