Solar System Planets: Order of the 8 (or 9) Planets


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Solar System Planets: Order of the 8 (or 9) Planets

by Robert Roy Britt   |   June 08, 2012 03:15pm ET
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The planets of the solar system as depicted by a NASA computer illustration. Orbits and sizes are not shown to scale.
The planets of the solar system as depicted by a NASA computer illustration. Orbits and sizes are not shown to scale.
Credit: NASA
Ever since the discovery of Pluto in 1930, kids grew up learning about the nine planets of our solar system. That all changed starting in the late 1990s, when astronomers began to argue about whether Pluto was a planet. In a highly controversial decision, the International Astronomical Union ultimately decided in 2006 to call Pluto a “dwarf planet,” reducing the list of “real planets” in our solar system to eight. But many kids (and adults) cling to the notion of nine planets.
Regardless of your view, here’s the order of the eight larger planets, starting nearest the sun and working outward through the solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.

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