Date: 14/03/2023 07:52:54
From: Tau.Neutrino
ID: 2006434
Subject: Strange Circular Sand Dunes Discovered on Mars by NASA Spacecraft

Strange Circular Sand Dunes Discovered on Mars by NASA Spacecraft

Sand dunes of many shapes and sizes are common on Mars. In this example, the dunes are almost perfectly circular, which is unusual. Credit: NASA/JPL-Caltech/University of Arizona

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Date: 14/03/2023 16:15:29
From: Bubblecar
ID: 2006657
Subject: re: Strange Circular Sand Dunes Discovered on Mars by NASA Spacecraft

Ta, interesting. It seems to be the outliers that are rounder.

>This is part of a series of images (see above) to monitor how frost disappears in the late winter; this observation appears to be free of frost. A previous image (below) shows when the surface was covered by frost.

I was thinking just the other day, that with all the landers and rovers they’ve sent to Mars, it’s still only the Viking 2 lander that has returned pictures of extensive frost viewed from the ground.

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