7: Ringworld, by Larry Niven.
Another exceptionally well-written hard sci-fi novel. Niven’s imagination leads us in the exploration of the theoretical megastructure known as a Dyson Ring, A rotating circular construction large enough to encompass a star at a distance which will allow for life. In this artificial setting, land masses and seas are placed along the inner strip which extends up to three million times the surface area of the Earth.
Similarly as with the Rama series, the origins of the Ringworld are unknown as its inhabitants are, apparently, unaware of the nature of the original architects of their world. Here too the exploration leads to new and shocking discoveries, combined with the intricate interactions between the species which populate the artifact. Another example of how imaginative fiction does not have to compromise with solid science.
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