Arrakis —informally known as Dune and later called Rakis—is a fictional desert planet featured in the Dune series of novels by Frank Herbert. Herbert's first novel in the series, 1965's Dune, is considered one of the greatest science fiction novels of all time, and it is sometimes cited as the best-selling science fiction novel in history.In Dune, Arrakis is the most important planet in the universe, as it is the only source of the drug melange. Melange (or, "the spice") is the most essential and valuable commodity in the universe, as it extends life and makes safe interstellar travel possible (among other uses). Harvesting the spice is also hazardous in the extreme, due to both the harsh climate of the planet and the fact that melange deposits are guarded by giant sandworms. Arrakis is also the home of the Fremen (Zensunni wanderers), and subsequently is the Imperial Capital of the Atreides Empire. Arrakis is the third planet orbiting the star Canopus, and it in turn is orbited by two moons, one of which has an albedo pattern resembling the desert kangaroo mouse, Muad'Dib, on it; the other moon has markings resembling a human hand. Source: Wikipedia (en)