“The 4% Universe” by Richard Panek is a non-fiction work that delves into the world of cosmology, specifically the quest to understand dark matter and dark energy, which together constitute about 96% of the universe. The title refers to the remaining 4% of the universe that is made up of ordinary matter, which is the focus of the book’s narrative.

The book is generally accurate in its portrayal of the key events and scientific developments in this field. Panek meticulously covers the chronology of discoveries, the scientists involved, and the milestones achieved in understanding dark matter and dark energy. He provides a detailed account of the scientific community’s efforts, weaving in interviews and personal stories of the pioneering scientists who work in this realm, such as those involved in the Supernova Cosmology Project and the High-Z Supernova Search Team, which both made groundbreaking discoveries in the late 1990s.

While Panek is not a scientist himself, he has conducted extensive research and interviews, allowing him to present the complex subject matter in an accessible way without compromising on factual accuracy. However, like any popular science book, it may simplify or omit highly technical details to make the content more engaging and understandable to the general reader.

Overall, the book is considered a reliable and insightful account of the history and developments in the field of cosmology related to dark matter and dark energy, offering both accuracy and readability.