main ship and home of millions of humans, 1000 years in the future in the Knights of Sidonia manga and anime series, created after the destruction of the earth along with other unnamed seed ships. Trantor, the capital of an interstellar empire in Isaac Asimov's Foundation series, is an ecumenopolis, a planet entirely covered in one huge metal-clad building, with only one small green space: the Emperor's palace grounds. The Ori Supergate seen in a number of episodes of Stargate SG1 could be classed as a megastructure. In The Hitchhiker's Guide to the Galaxy series, Earth, as well as other planets, were artificial megastructures. Earth was intended to function as a gigantic computer and was built by a race of beings who made their living by manufacturing other planets. Mata-Nui in the BIONICLE franchise is classifiable as a megastructure. In the story, he is a massive robot as tall as a planet, and inside his body, every inhabitant of the BIONICLE Universe (Matoran, Toa, etc.) all live, unaware that they live inside a massive, space-traveling entity. In the Robotech Sentinels novels, Haydon IV is an artificially constructed cyber-planet with android citizens. In the Invader Zim episode "Planet Jackers", two aliens surround the Earth with a fake sky in order to throw it into their sun. In the 2017 video game Destiny 2, the fleet of Dominus Ghaul, the ruler of the Cabal Empire, features a massive super-weapon named the Almighty, whose wingspan is said to be as wide as the planet Mercury. Almighty links itself to a solar system's star on the quantum level via an energy beam and breaks it down into usable fuel, warping to another system before the star collapses into a supernova. Nightmare's fortress from Kirby: Right Back at Ya! can be classified as a megastructure because it is the size of a small planet. In several works, Arthur C. Clarke writes about a colossal hollow tube, first described in Rendezvous with Rama (1973), and inhabited by different races. The Citadel in the Mass Effect universe is an enormous space station constructed by an ancient race of machines called the Reapers millions of years before the games in the series. At the time of Mass Effect 2, its population is 13.2 million. In the game Airforce Delta Strike a large Space Elevator called the Chiron Lift is used to send supplies out into outer space. In