Mars Wears Purple Near Its South Pole

ESA's Mars Express has captured Thyles Rupes in swirls of violet and pink — and the science behind those colours is as layered as the ice itself.

By The space-quantum Desk

Mars is not, it turns out, merely red. [1]

The High Resolution Stereo Camera (HRSC) captured the scene during martian spring, when morning light, atmospheric dust, and a ground cover of frost conspire to shift the palette dramatically away from the familiar ochres and tans. Darker patches owe their hue to volcanic material rich in mafic minerals — olivine and pyroxene — while paler areas carry frosty deposits of carbon dioxide that persist even in spring. [1]

Unlike Earth, present-day Mars lacks active tectonics; these forces played out billions of years ago. [1]

What the image really does is remind us how much a single variable — light angle, atmospheric load, a dusting of frost — can reframe a familiar place entirely. Colour is data, and Mars has been holding back.

[1]

The general berry-purple hue of this scene is due to a mix of light, dust, and frost.ESA