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Astronomy pictures of the week (2012.11.4-11.10)

（）  09:21, November 10, 2012

Lenticular Clouds Over Washington. Are those UFOs near that mountain? No -- they are multilayered lenticular clouds. Moist air forced to flow upward around mountain tops can create lenticular clouds. Water droplets condense from moist air cooled below the dew point, and clouds are opaque groups of water droplets. (Photo/ NASA)

Edited and Translated by Yao Chun, People's Daily Online


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（Editor：陳麗丹、姚春）

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