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A group of amateur stargazers has identified an entirely new form of aurora that looks a bit like sand dunes.
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NASA's Curiosity rover has photographed a huge wall of sand on the edge of the Martian desert.
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A French architectural firm has put forward a concept for a futuristic city situated in the desert.
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Scientists have determined how huge sand dunes up to 300ft high managed to form on the Saturnian moon.