A Photo History of the Space Shuttle Program

Silhouette
The shuttle Endeavour, as photographed over Earth by an International Space Station crew member. The orange layer is known as the troposphere, where all of the weather and clouds are generated and contained. It gives way to the whitish stratosphere and then into the mesosphere. The black segment is part of a window frame, not space.

• NASA's New Mars Rover 'Curiosity'