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Subject Seven years of Mars Express – unusual structures at Magellan Crater

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The scene shown here, from the northern edge of the Magellan Crater, was acquired from an altitude of 500 kilometres on 6 February 2009 during orbit 6547 and has a resolution of about 25 metres per pixel. The images show an area at 34°S and 185°E. Measuring about 190 kilometres by 112 kilometres, the area shown covers about 21,280 square kilometres, which is about the size of Slovenia.

In the west of the area (on the upper edge of the topmost image – north is to the right) conspicuous, irregularly shaped light-coloured blocks are visible. These features are up to two kilometres in size and are probably large rock fragments or mounds of rock. However, the mechanism by which they were formed is still being debated. One possibility is that the top layer of rock was shattered by the shockwaves from an impact.

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