Compiled with the help of a team of expert contributors under the editorship of renowned author and broadcaster Ian Ridpath, the third edition of this dictionary covers everything from space exploration and the equipment involved to astrophysics, cosmology, and the concept of time. The dictionary also includes biographical entries on eminent astronomers, as well as worldwide coverage of observatories and telescopes. Supplementary material is included in the appendices, such as tables of Apollo lunar landing missions, the constellations, and planetary data, and numerous other tables and diagrams complement the entries.

The new sixth edition of the Dictionary of Minor Planet Names, which is the IAU's official reference work for the field, now covers more than 17,000 named minor planets.

Distinguished stellar illustrator Wil Tirion has drawn 20 new star maps especially for inclusion here. A myriad of named astronomical objects, constellations, observatories and space missions are described in detail, as well as biographical sketches for 70 of the most luminous individuals in the history of astronomy and space science.