When the Earth Had Two Moons

[Asphaug's] writing is peppered with playful images... He is at his most charming when he is not just telling how scientists currently think about the chaotic formation of the solar system but relaying his own part in the story, as with the idea of that second moon. He perfectly captures the way that so many scientific insights occur: while sitting listening to something else and having your mind wander...embracing the chaos around us, as Mr. Asphaug does, ultimately makes the solar system an even weirder and more wonderful place than it seemed before. -- Wall Street Journal A gripping and endlessly fascinating account of how planets formed. -- Alan Stern, planetary scientist and leader of NASA's New Horizons mission to Pluto When the Earth Had Two Moons is a lyrical exploration of our solar system, introducing not just the facts of its formation and nature but the implications for all of us living on Earth. -- Amy Mainzer, visiting scientist at the Jet Propulsion Laboratory and professor of planetary science at the University of Arizona An enthusiast as well as a fine writer, Asphaug lays it out from the beginning. . . . An expert, entertaining review of what's known about the solar system. -- Kirkus Reviews Asphaug draws upon his years of research and expertise to provide the reader with a truly wondrous and surprising exploration of planet formation and the origins of life. A meticulous and expertly presented work of science, When the Earth Had Two Moons is unreservedly and enthusiastically recommended. -- Midwest Book Review An enthusiastic and erudite guide. -- Publishers Weekly