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Astronomy pictures of the week (2012.11.18-11.24) (4)

People's Daily Online)  11:39, November 24, 2012

A Halo Around the Moon. This fairly common sight occurs when high thin clouds containing millions of tiny ice crystals cover much of the sky. Each ice crystal acts like a miniature lens. (Photo/ NASA)


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(Editor:马茜、梁军)

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