A perfectly smooth cylinder enters our solar system

Countries & Cities · Published 12 October 2026 Swipe more like this →

In short: In Arthur C. Clarke's 1973 masterpiece, humanity encounters an interstellar object designated 31/439. This 50-kilometre-long cylinder defies natural explanation, prompting a desperate mission by the ship Endeavour to uncover whether the visitor is a vessel, a phenomenon, or something far more complex.

The novel, which won the Hugo, Locus, and Nebula awards, describes a massive cylindrical starship measuring 50 kilometres in length and 20 kilometres in diameter. Upon entering the Solar System, the object is eventually named Rama. The crew of the Endeavour discovers a world of artificial complexity, including two vast plains divided by a frozen body of water known as the Cylindrical Sea. Within this interior landscape, they find city-sized clusters of geometric structures, which the explorers name after Earth cities like London, Paris, Tokyo, and New York.

The internal mechanics of Rama suggest highly advanced engineering. The ship provides artificial gravity through a 0.25 rpm spin and utilizes three identical staircases—Alpha, Beta, and Gamma—to descend from the North Pole. The crew also encounters 'biots,' creatures that Surgeon-Commander Laura Ernst identifies as being both biological and robotic. These entities appear to be designed by the Ramans to disassemble and dispose of debris.

The story's themes of cosmic indifference and technical imagination have left a lasting legacy. While some critics noted a lack of character development, others, like John Leonard of The New York Times, praised Clarke's ability to convey a chilling, unknowable alien presence. The novel's concept of a 'Spaceguard' system to track hazardous objects was so influential that a real-world project of the same name was initiated in 1992, with NASA authorization and funding following public interest in asteroid strike risks.

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