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Photos: Nasa's top 10 on Earth
The best seat in the house...

By CNET News.com staff

Published: Thursday 24 April 2008

In this 2003 photo from Expedition 7, you can see layers of the Earth's atmosphere. The orange troposphere is the lowest and most dense section. The tropopause is the section between the troposphere and the blue atmosphere.

Photo credit: Nasa

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