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Eco-photos of the week: July 17-23

By: Catie Leary on July 21, 2011, 4:45 p.m.
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Last ride for Atlantis

Space shuttle Atlantis is silhouetted against the Earth in this photograph, taken July 19 by an astronaut aboard the International Space Station. Atlantis undocked from the station for the final time the next day and began preparations to return home.

During their 13 days in space, the shuttle crew supplied the ISS with a new logistics module; tested tools, technologies and techniques to refuel satellites in space; and collected old equipment and trash to bring back to Earth.