1. Columbia Accident Investigation Board Official site for the Board investigating the February 2003 loss of the Space Shuttle Columbia. http://www.caib.us/
2. Columbia Shuttle Funds provides information on various funds benefitting the children and families of the astronauts lost in the explosion of the Space Shuttle Columbia. http://www.columbiashuttlefund.com/
3. Hubble Project Servicing Mission 3B launch and mission FAQ, details, news, updates, and multimedia from NASA Goddard Space Flight Center. http://sm3b.gsfc.nasa.gov/
4. Return to Flight Task Group external task force providing an independent assessment of NASA's return to flight efforts for the Space Shuttle program. http://www.returntoflight.org/
5. United Space Alliance a Boeing/Lockheed Martin joint venture chartered to manage and conduct space operations work involving the operation and maintenance of multi-purpose space systems. http://www.unitedspacealliance.com/