Silhouetted against Earth's atmosphere, the Space Shuttle Endeavour cuts a striking figure in this 2010 photo taken from the International Space Station. The shuttle approaches the station against a backdrop of the layers of the atmosphere. The blue layer directly behind the shuttle is the mesosphere, and the white layer is the stratosphere. Below that is Earth's troposphere, the lowest portion of the atmosphere, seen in orange.
(Image credit: Expedition 22 Crew, NASA)
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