NASA - National Aeronautics and Space Administration
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The Origins Education Forum and NASA's Education Support Network concluded on September 30, 2009.

Please visit NASA at http://nasascience.nasa.gov/ for current information about NASA's science, education, and public outreach activities.

Origins Education Forum

Click on the link below to find the definition of a space-related term.

Hubblesite/Amazing-Space Glossary

This glossary defines terms and abbreviations that relate to the Hubble Space Telescope and its discoveries, technology, operations and partners; and to astronomy, physics and cosmology in general. Glossary terms can be accessed either alphabetically or by subject.

http://hubblesite.org/reference_desk/glossary/ or
http://amazing-space.stsci.edu/glossary/