Snapshot: Sunlight on an icy martian crater
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Abstract
First three-dimensional colour image reveals a frozen wonder.
This image from the Mars Express spacecraft shows a pocket of water ice nestling in a martian crater, bathed in the late martian summer sun.
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The shadow of the crater's rim, which towers 300 metres over the surrounding plains, prevents the ice from vaporizing in the planet's thin atmosphere. A dusting of frost survives inside the rim to the upper right, while the sun glimmers on its south-facing outer edge.
The 35-kilometre-wide crater sits 70° north of the martian equator, in a low-lying region known as Vastitas Borealis. Previous orbiters have spotted ice deposits in craters, but the High Resolution Stereo Camera on board the European probe is the first to return a three-dimensional colour image of an icy spot. The ice may be up to 200 metres thick, and lies over a dune field that has formed in the sediment on the crater's floor. The data were collected on 2 February, and this image was created for Nature last week.
