Glossary of Astrophysics Terms – http://web.archive.org/web/20150321110136/http://ie.lbl.gov/education/glossary/glossaryfa.htm
Note: Seems to have dropped off the live web soon after March 2015.
Representative questions that can be answered with this resource:
- What is helium burning?
- Why are there more protons in the universe than neutrons?
- How is nuclear fusion different in stars heavier than the Sun?
Definition of astrophysics terms slanted towards high energy research. Contains links to animations and additional background materials.