Welcome to the Glossary of Astronomical Terms. 
Here you will find listings for many terms and topics.  Start by selecting from the alphabet above.   Underlined words have their own entry in the glossary.  Enjoy!

Terms and definitions have been compiled from many sources including (but not limited to):

Kaufmann, Freedman Universe 5th Ed., Freeman, 1999
Zeilik Astronomy: The Evolving Universe, 8th Ed., Wiley, 1997
Snow Essentials of the The Dynamic Universe, 4th Ed., West, 1993
NASA
HST Key Project
and, thanks to many others.

Please point out errors to dgreen@pepperdine.edu.  Thanks!