Imperial Earth (1975) is a saga about the colonization of the solar system. The thematic determinants of the novel are determined by extrapolations of scientific hypotheses related to interplanetary travel, and by the SETI program.
J. B. S. Haldane (1892–1964), a British geneticist, evolutionary biologist, and science popularizer, wrote "My Friend Mr. Leakey" in 1937 – a collection of five humorous, fantastic stories for children (and adults).