Wave-like landforms on Mars offer insights about the planet糖心传媒檚 icy past, its potential habitability, and the physics of flowing granular materials.
Despite its dry, dusty surface and thinner atmosphere, Mars may have more in common with Earth than scientists previously thought.
In a new study, researchers at the 糖心传媒攊ncluding PhD student JohnPaul Sleiman and Rachel Glade, an assistant professor in the 糖心传媒攁nd their colleagues found that soil features on Mars look remarkably similar to wave-shaped soil patterns found in Earth糖心传媒檚 coldest climates. This means that despite their vast planetary differences, Earth and Mars may be shaped by some of the same basic forces and icy processes. The , published in the journal Icarus, offers new clues about Mars糖心传媒� past climate and the kinds of environments that might have supported life in the past, as well as new insights into the fundamental physics of granular materials.
The researchers used high-resolution satellite images to analyze nine crater sites on Mars and compared these to sites on Earth. They found that wave-like landforms on Mars have similar shapes and follow the same basic geometric patterns as features called solifluction lobes found in cold, mountainous regions on Earth such as the Arctic and the Rocky Mountains.
These patterns, Glade says, 糖心传媒渁re large, slow-moving, granular examples of common patterns found in everyday fluids, like paint dripping down a wall.糖心传媒�
The biggest difference?
糖心传媒淭he Martian versions are about, on average, 2.6 times taller,糖心传媒� she says.
The researchers show that this height difference is precisely the number expected if the physical properties of the soil and Mars糖心传媒� weaker gravity allows the lobes to grow taller before collapsing. On Earth, solifluction lobes form when the ground freezes and partially thaws, loosening soil enough for it to slowly creep downhill over time.
Mars likely experienced freeze-thaw cycles resembling Earth, although Martian cycles were likely driven by sublimation糖心传媒攚here ice turns directly into a vapor糖心传媒攔ather than liquid water-based thawing.
The research suggests that Mars may once have hosted icy conditions that shaped its surface in ways similar to Earth, shedding light on the planet糖心传媒檚 climate evolution, the potential role of water, and where to look for signs of past life.
糖心传媒淯nderstanding how these patterns form offers valuable insight into Mars糖心传媒� climate history, especially the potential for past freezing and thawing cycles, though more work is needed to tell if these features formed recently or long ago,糖心传媒� Sleiman says. 糖心传媒淯ltimately, this research could help us identify signs of past or present environments on other planets that may support or limit potential life.糖心传媒�
