Includes index.

"This is the 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 have come together to explore the frozen boundary of the solar system"--Jacket.

Prologue -- The edge of the solar system -- The Centaurs -- The mystery of the short-period comets -- Shooting in the dark -- Deeper and deeper -- Sorting out the dynamics -- What are little planets made of? -- Numbers and sizes -- Things that go bump in the dark -- Dust and discs -- Where do we go from here? -- Will we ever get our names right? -- Appendix 1: Dramatis personae -- Appendix 2: Guidelines for minor planet names -- Index.

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