The Firefly Encyclopedia of Astronomy

This book is AMAZING! It is chock full of terms and definitions, plus gorgeous pictures. It is not one of those books with no color or pictures in it. So you not only have a wealth of information at your fingertips, but you also get to see beautiful pictures/examples of terms along the way.

1,750 entries, 350 color photos and 35 essays written by experts

A wonderful astronomy resource. Has informative articles written by amateurs smattered throughout -- in just the right amounts and at just the right places. Similar to my "The Universal Book of Astronomy : From the Andromeda Galaxy to the Zone of Avoidance" book, but with more depth to most definitions. Many full color illustrations and photos. The only thing I don't like in the Firefly one better than the "The Universal Book of Astronomy : From the Andromeda Galaxy to the Zone of Avoidance" book is that this book doesn't list out the stars of each constellations with distances like the Universal Book does. The only solution -- buy both! :)