Space shuttle Atlantis lifted off on Friday, July 8, shown above. This is the shuttle program’s final flight — it’s a 12-day mission to the International Space Station. Today, spacewalkers Mike Fossum and Ron Garan completed a six-hour, 31-minute spacewalk at 3:53 p.m. Eastern Daylight Time. It was the 249th spacewalk by U.S. astronauts (shown below are Garan [top] and Fossum exiting the International Space Station's Quest airlock to begin their spacewalk.

Photos courtesy of NASA and NASA TV. 

Jessica Mulholland  |  Web Editor/Photographer

Jessica Mulholland has been a writer and editor for more than 10 years. She was previously the editor of Emergency Management magazine, and she loves that she can incorporate her passion for photography into her work as a part of the Government Technology editorial team. Jessica can be reached at on Twitter and on Google+.