Photos: Nasa's top 10 on Earth

The best seat in the house...

By CNET News.com staff on 24 April 2008 17:33

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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