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Hades the underworld of Greek mythology, ruled by the god Pluto.
planet a large body in outer space that circles around the sun or another star. Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto are all planets in our solar system.
Pluto Pluto is a large round thing in outer space. Like our Earth, it travels around the sun. Scientists used to call Pluto a planet. It was the planet that was the smallest and farthest from the sun. But, now, scientists think Pluto is a little different from a real planet, and they don't call it a planet anymore.