Sand ’megaripples’ migrate in Martian deserts

In a new research study, scientists show for the first time that large sand ripples known as megaripples are migrating in Martian deserts. The finding suggests Mars’s dusty surface might be much more active than previously suspected, offering clues about the Red Planet’s poorly understood atmosphere. Sand dunes and ripples are typical features of deserts on Earth and Mars. Megaripples are distinguished from smaller ripples by the coarser sand grains that gather at their crests and their larger size: the r