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Planets are large celestial bodies in orbit around a star. Sometimes, large moons are also called planets - especially if they are able to support some kind of life. A typically habitable planet is about 6,000 kilometres in diameter, while large gas giants can be much bigger. Planets can be host to millions of sentient inhabitants, or barren wastelands, or anywhere in between.
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What is the first work to feature a planet that is one city?
According to these sources, the first person to write about city planets was the preacher and spiritualist poet Thomas Lake Harris: way back in the 19th century, he wrote poetry about themes including … interplanetary empires, imperial cities entirely covering planets, and the "ancient astronaut" myth in which space travellers help early humans with agriculture, technology and spiritual development. …