Rendezvous with Rama – Arthur C. Clarke

Rama is a vast alien spacecraft that enters the Solar System, A perfect cylinder some fifty kilometres long, spinning rapidly, racing through space, Rama is a technological marvel, a mysterious and deeply enigmatic alien artifact. It is Mankind's first visitor from the stars and must be investigated . . . Winner of the Hugo Award for best novel, 1974 Winner of the Nebula Award for best novel, 1973 Winner of the John W. Campbell Award for best novel, 1974 Winner of the BSFA Award for best novel, 1973