The sand dunes were imaged as part of a program to see how frost melts on the Red Planet in late winter.
The collection of images is being used to monitor how frost recedes and melts on the Martian surface as the Red Planet reaches the end of its winter season. Illustrating this, while this image appears frost-free a similar image of the same sand dunes previously taken shows what they looked like while still covered in frost.
The sand dune image was taken while the MRO was at an altitude of around 185 miles over the Martian surface. Each pixel in the image represents 25 centimeters . This is just one of 60 sites on Mars being monitored by HiRise. The high-resolution camera has been orbiting the Red Planet since the MRO reached Mars in 2006 and began conducting the first dedicated survey of the planet's sand dunes.
Collecting repeated observations of sand dunes over the Martian year has allowed planetary scientists to monitor how fast the dunes move. This has revealed that sand dunes from the equator to the poles are advancing at rates of up to 3.3 feet
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