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The Solar System Definition of a Planet Until the report of this Working Group is received, all objects discovered at a distance from the Sun greater than 40 AU will continue to be regarded as part of the Trans-Neptunian population. | Mysterious Sedna March 15, 2004: NASA-funded researchers have discovered the most distant object orbiting the sun. It's a mysterious planet-like body three times farther from Earth than Pluto. | Planets Planets in our solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto. |
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