NASA is undergoing major internal rearrangements in a process to align their projects to the New Vision for Space Exploration
http://www.nasa.gov/missions/solarsystem/bush_vision.html.

The seven enterprises have been merged into four mission directorates, as follows:

• Science Mission Directorate: http://www.nasa.gov/lb/about/highlights/Science_Mission_Directorate. http://www.exploration.nasa.gov/
• Aeronautics Research Mission Directorate: http://www.aerospace.nasa.gov/ http://www.hq.nasa.gov/osf/
• The Education Enterprise projects will be embedded in all the mission directorates and coordinated through the Office of Education: http://education.nasa.gov/home/index.html