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As Pluto, a dwarf planet, is no longer counted as a planet, there are now only 8 known planets in our solar system.

It remains to be seen if the discovery of extra-solar planets affects how we classify objects within our solar system. Several hundred likely planets have been detected orbiting other stars, with the possibility that there are other solar systems like our own. By late 2011, a total of 599 exoplanets had been identified and another 1235 were pending corroboration.

Status of Pluto

Pluto is a dwarf planet in the solar system and the prototype of a yet-to-be-named family of Trans-Neptunian objects. From its discovery in 1930 until 2006, it was considered the ninth and smallest of the planets of the Solar System, both by the International Astronomical Union (IAU) and the general public. After much debate, the IAU decided on August 24, 2006 to reclassify Pluto as a dwarf planet, requiring that a planet must "clear the neighborhood around its orbit." Further observations may also affect the definition of Charon as a moon of Pluto, possibly the classification of the two as a binary planet.

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