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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.
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The book describes man's discoveries of parts of planet Earth that were accidental or planned. The period from 50,000 years ago to today's efforts in space exploration is described.
A popular science work in which Asimov, combining scientific rigor with a lucid style, explores possible threats to the survival of humanity, systematizing disasters according to their nature and probability.