What in Mars' name?
These images were taken as part of an ongoing effort to monitor the receding frost as the Martian winter enters its final stages. The cycle of seasons on Mars is actually fairly similar to our own, even though a Martian year is considerably lengthier at 687 Earth days.
Of particular interest to planetary scientists is Mars' northern hemisphere, where these dunes were photographed free of ice. An earlier image, though, shows their surfaces clearly permeated by frost. These circular dunes aren't the only strange dunes scientists have found so far on the Red Planet. In 2016, NASA's Curiosity roverarranged in a pattern that researchers said is not found on Earth.
Dunes continue to be an object of both fascination and of meticulous study for planetary scientists, as their malleable yet slowly shifting forms make them almost like geological footprints of the planet's wind and atmosphere.to date tracked nearly 500 of them using the HiRise camera, and discovered that Martian dunes move only at a meager rate of two feet per year, a snail's pace compared to some on Earth that move over 100 feet.
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