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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/