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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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Sol Ⅲ = Earth: What is the origin of this planetary naming scheme?

Remember that before heliocentric (or geocentric) models came to a good description of the solar system, people didn't even know that planets had an ordering. … In much sci-fi, planets are known under multiple names - some are official designations, some are local names, others are well-known nicknames. …
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