Rendezvous with Rama is a science fiction novel by British writer Arthur C. Clarke first published in 1973. Set in the 2130s, the story involves a cylindrical alien starship that enters the 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. The novel won both the Hugo and Nebula awards upon its release, and is regarded as one of the cornerstones in Clarke's bibliography. The concept was later extended with several sequels, written by Clarke and Gentry Lee. Plot After an asteroid falls in Northeast Italy on 11 September 2077, creating a major disaster, the government of Earth sets up the Spaceguard system as an early warning of arrivals from deep space. The "Rama" of the title is an alien starship weighing at least ten trillion tons, initially mistaken for an asteroid categorised as "31/439". It is detected by astronomers in the year 2131 while it is still outside the orbit of Jupiter. Its speed (100,000 km/h – 62,150 m/h) and the angle of its trajectory clearly indicate it is not on a long orbit around the sun, but is an interstellar object. The astronomers' interest is further piqued when they realise the asteroid has an extremely rapid rotation period of four minutes and is exceptionally large. It is named Rama after the Hindu god, and an uncrewed space probe dubbed Sita is launched from the Mars moon Phobos to intercept and photograph it. The resulting images reveal that Rama is a perfect cylinder, in diameter and long, and almost completely featureless, making this humankind's first encounter with an alien spacecraft. The solar survey vessel Endeavour is sent to study Rama, as it is the only ship close enough to do so in the brief period Rama will spend in the Solar System. Endeavour manages to rendezvous with Rama one month after it first comes to Earth's attention, when the alien ship is already inside Venus's orbit. The crew, led by Commander Bill Norton, enters Rama through a safety system consisting of triple airlocks, and explores the 16-km wide by 50-km long cylindrical world of its interior, but the nature and purpose of the starship and its creators remain enigmatic throughout the book. Rama's inner surfaces hold "cities" of geometric structures that resemble buildings and are separated by streets with shallow