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Astronomy pictures of the week (2012.10.20-10.27)

People's Daily Online)  09:33, October 27, 2012

Mammatus Clouds Over Saskatchewan. Normal cloud bottoms are flat. This is because moist warm air that rises and cools will condense into water droplets at a specific temperature, which usually corresponds to a very specific height. As water droplets grow, an opaque cloud forms. (Photo/ NASA)

Edited by Yao Chun, People's Daily Online

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(Editor:姚春、马茜)

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