Arthur C. Clarke's sci-fi novel Rendezvous with Rama
Rendezvous with Rama is a novel by Arthur C. Clarke first published in 1972. Set in the 22nd century, the story involves a fifty-kilometre-long cylindrical alien starship that enters Earth's solar system. The story is told from the point of view of a group of human explorers, who intercept the ship in an attempt to unlock its mysteries.
This novel won both the Hugo[1] and Nebula[2] awards upon its release, and is widely regarded as one of the cornerstones in Clarke's bibliography. It is considered a science fiction classic, and is particularly seen as a key hard science fiction text. (copied from Wikipedia.org)