Neptune

late 14c., "god of the sea," from Latin Neptunus, son of Saturn, brother of Jupiter, the Roman god of the sea (later identified with Greek Poseidon), probably from PIE root *nebh- "cloud" (source of Latin nebula "fog, mist, cloud"), via a sense of "moist, wet." The planet so named was discovered by German astronomer Johann Gottfried Galle (1812-1910) in 1846. Until the identification of Pluto in 1930, it was the most distant planet known.

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