In the Advanced Dungeons & Dragons role-playing game, Spelljammer is a campaign setting which features a fantastic outer space environment. Spelljammer introduced into the AD&D universe a comprehensive system of fantasy astrophysics, including the Ptolemaic concept of crystal spheres. Crystal spheres may contain multiple worlds and are navigable using ships equipped with spelljamming helms. Ships powered by spelljamming helms are capable of flying into not only the sky but into space.

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