"The Hunt for Planet X is an adventure story or, more accurately, a series of adventure stories. Schilling tells them well, capturing both the science and the people involved. It starts with the classics: Uranus, Neptune and Pluto; and moves all over the solar system as ground-based astronomers and space scientists pour over measurements and observations to try to understand the worlds around us. Current debates about the Pioneer Anomaly and the definition of what is a planet make the book current as well as a good history."
Dr. Louis Friedman, Executive Director, The Planetary Society

"This exciting tale of the centuries-old search for new planets in the solar system reads like a thriller. It is an adventure packed with fierce competition, brilliant discoveries, dumb errors, lucky coincidences and artful intrigue - in short, the full spectrum of the human drama. The story reaches an exciting climax in 2006, when we lost Pluto as a planet but gained a number of ice dwarfs in return. This colorful account chock-full of fascinating details is an excellent metaphor for the great adventure of science."
Robbert Dijkgraaf, Professor of Mathematical Physics at the University of Amsterdam

The Hunt for Planet X: New Worlds and the Fate of Pluto goes beyond a standard scientific read, encompassing who, and what, is involved in the pursuit of planetary endeavors. Touching on over three-hundred years of debates, debacles and discoveries, this book offers the reader insight into the minds and motives of planetary astronomers and their findings. The "hunt" continues tothe outer-most regions of the solar system, and Govert Schilling states this search will not cease: "Astronomy is an adventurous science," he writes, and without adventure and those who seek it out the universe would otherwise remain mysterious. The real-life characters presented in The Hunt for Planet X look for glimpses of light in the dark, from icy Kuiper Belt objects to full-fledged planets, in the process challenging how such worlds should be defined and ultimately describing the Universe.