Caveat: I am not an astrophysicist and I make mistakes and harbor misconceptions, so if you are depending upon what you are learning, take these explanations as no more than a hint.

This glossary gives you (and me) a quick way to look up terms in astrophysics research papers and presentations. It is decent regarding facts, but you should reserve judgment on explanations of the science. Terms used in astrophysical research vary by subdiscipline (and researcher), are constantly changing and no glossary can keep up. Explanations of obsolete terms still have value because you run across them when reading referenced papers. The further reading references are just that and are not (necessarily) my sources. If I've found no online explanations, any listed further reading is merely a page that uses the term.