The essay section contains articles outlining the history and significant milestones in modern cosmology, as well as developments that can be expected from new technological advances. The essays are clearly written and do not rely heavily on mathematical equations in their text. Words and concepts that are defined in the dictionary section of the book are highlighted in the essays. Each essay concludes with a list of references for further reading. The dictionary entries are quite long, bordering on encyclopedic.
Descriptions are well written and are coded as to treatment level.
Most entries avoid the use of mathematical formulas and are unmarked. Entries with one star require a knowledge of mathematics at or beyond the first year undergraduate level. Entries with two stars are advanced concepts with rigorous mathematical treatment. Most of the dictionary entries have recommendations for further reading. The book contains a bibliography of sources and has an excellent index.