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Astronomy pictures of the week (11.25-12.1) (6)

People's Daily Online)  08:11, December 03, 2012

Dark Sand Cascades on Mars. They might look like trees on Mars, but they're not. Groups of dark brown streaks have been photographed by the Mars Reconnaissance Orbiter on melting pinkish sand dunes covered with light frost. (Photo/ NASA)


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(Editor:姚春、王金雪)

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