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Kaguya, Japan’s second unmanned mission to the Moon, launched by the Japan Aerospace Exploration Agency in September 2007. Its proper name, Selene (Selenological and Engineering Explorer), was derived from the ancient Greek goddess of the Moon. Kaguya, chosen from among many suggestions received from the Japanese public, is the name of a legendary princess who spurns earthly suitors and returns to the Moon. Kaguya comprised three spacecraft launched together and then deployed once in lunar...