Hardened Dunes in Arcadia Planitia
HiRISE PICTURE OF THE DAY: 25 SEPTEMBER 2022
Hardened Dunes in Arcadia Planitia

There are several lines of evidence indicating that the dunes have become hardened into cohesive sediment or even into sandstone rock.



Marvelous Martian Mega-Ripples
Based on their shapes and examples of fractured crests in some areas, mega-ripples are thought to be largely inactive relics of past climates.

Boundary Condition Controls on the High-Sand-Flux Regions of Mars
It is often unclear where and why sediment is mobile on today’s Mars. A new paper takes a deeper look.