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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?

found a literary description of the naming scheme in a comic Antares Episode 1 – October 2007 ISBN 978-1-84918-097-9: Clarifications concerning the naming of the planet The names of extra-solar planets … Populated planets tend to have names, as do those with strategic value. With billions upon billions of planets in just one galaxy, however, most planets simply have a classification. …
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Sol Ⅲ = Earth: What is the origin of this planetary naming scheme?

The planets of each star are listed by Roman numerals according to their distances from their sun, and the moons of a particular planet are listed by Roman letters according to their distance from the …
Alexander's user avatar
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