• Aeronautics Research Mission Directorate (ARMD): http://www.aeronautics.nasa.gov/
• Human Exploration and Operations (HEOMD): http://www.nasa.gov/directorates/heo/home/index.html
• Science Mission Directorate (SMD): http://science.nasa.gov/
• Space Technology Mission Directorate (STMD):http://www.nasa.gov/directorates/spacetech/home/index.html

Information about NASA Field Centers and Facilities can be found at:

• NASA Headquarters, Washington, DC: http://www.nasa.gov/centers/hq/home/index.html
• Ames Research Center, CA: http://www.nasa.gov/centers/ames/home/index.html
• Armstrong Flight Research Center, CA: http://www.nasa.gov/centers/armstrong/home/index.html
• Glenn Research Center, OH: http://www.nasa.gov/centers/glenn/home/index.html
• Goddard Institute for Space Science, NY: http://www.giss.nasa.gov/
• Goddard Space Flight Center, MD: http://www.nasa.gov/centers/goddard/home/index.html
• Jet Propulsion Laboratory, CA: http://www.nasa.gov/centers/jpl/home/index.html
• Johnson Space Center, TX: http://www.nasa.gov/centers/johnson/home/index.html
• Kennedy Space Center, FL: http://www.nasa.gov/centers/kennedy/home/index.html
• Langley Research Center, VA: http://www.nasa.gov/centers/langley/home/index.html
• Marshall Space Flight Center, AL: http://www.nasa.gov/centers/marshall/home/index.html
• NASA IV&V Facility, WV: http://www.nasa.gov/centers/ivv/home/index.html
• Stennis Space Center, MS: http://www.nasa.gov/centers/stennis/home/index.html
• Wallops Flight Facility, VA: http://www.nasa.gov/centers/wallops/home/index.html
• White Sands Test Facility, NM: http://www.nasa.gov/centers/wstf/home/index_old.html