Held up by the heliopause? Floored by the flatness problem? Intimidated by MACHOs? With the Cambridge Astronomy Dictionary you'll no longer be defeated by such astronomical jargon! These and 3,200 additional words, names, and abbreviations used in amateur and professional astronomy, are clearly and concisely defined. Entries include information from modern and classical astronomy,
This is really a reference book, so I only claim to have read parts of it. I bought it years ago in CA while attending a friend's wedding. It's become useful from time to time over the years and doesn't yet feel too out of date.