In the ten years preceding publication, the known solar system more than doubled in size. For the first time in almost two centuries an entirely new population of planetary objects was found. This 'Kuiper Belt' of minor planets beyond Neptune revolutionised our understanding of the solar system's formation and finally explained the origin of the enigmatic outer planet Pluto. This is the fascinating story of how theoretical physicists decided that there must be a population of unknown bodies beyond Neptune and how a small band of astronomers set out to find them. What they discovered was a family of ancient planetesimals whose orbits and physical properties were far more complicated than anyone expected. We follow the story of this discovery, and see how astronomers, theoretical physicists and one incredibly dedicated amateur observer came together to explore the frozen boundary of the solar system.

About the Author

John Davies is an astronomer at the Joint Astronomy Centre in Hilo, Hawaii. His research focuses on small solar system objects. In 1983 he discovered six new comets with the Infrared Astronomy Satellite (IRAS) and since then he has studied numerous comets and asteroids with ground and space based telescopes.

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