The Hitchhiker's Guide to the Galaxy is the title of the first of five books in the Hitchhiker's Guide to the Galaxy comedy science fiction "trilogy" by Douglas Adams (with the sixth written by Eoin Colfer). The novel is an adaptation of the first four parts of Adams' radio series of the same name. The novel was first published in London on 12 October 1979. It sold 250,000 copies in the first...