Two sizes of wind-sculpted ripples are evident in this view of the top surface of a Martian sand dune. Sand dunes and the smaller type of ripples also exist on Earth. The larger ripples — roughly 10 feet apart — are a type not seen on Earth. Credit: NASA/JPL-Caltech/MSSSSand ripples are fascinating. They are symmetrical yet wind, which causes them, is very much not. Furthermore, they can be found onand on Earth.
Imitating Martian sand was not easy because it’s finer than sand here on Earth, explains Prof. Yizhaq, but the breakthrough occurred when they decided to try tiny glass balls to represent fine grains of sand. Furthermore, the international research team has proposed a unified theoretical framework that would explain sand ripples on Mars and on Earth. At its most basic level, sand ripples on Mars caused by wind look like sand ripples on Earth caused by water.
The wind tunnel at Aarhus University in Denmark allows the pressure to be reduced to that on Mars, which is 200 times smaller than atmospheric pressure on Earth. The tunnel is inside the large red tank. Credit: Prof. Hezi Yizhaq/BGU
Source: Tech Daily Report (techdailyreport.net)
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