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How many planets are in our Solar System?

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Solar System

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How many solar planets (a celestial body that is in orbit around the Sun, has sufficient mass so that it assumes a nearly round shape and has "cleared the neighbourhood" around its orbit) are there in The Solar System, consisting of the Sun and the astronomical objects gravitationally bound in orbit around it, all of which formed from the collapse of a giant molecular cloud approximately 4.6 billion years ago?
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There are 11 planets, but some think that Pluto is not a planet because of its size. The planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto, and recently discovered dwarf planets Eris and Xena.
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Posted at 16:24 on September 18, 2010.
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External web pages (using standard web search):

Solar System - Wikipedia, the free encyclopedia
Though it contains at least three dwarf planets, it is composed mainly of small Solar System bodies. However, many of ... Location of the Solar System within our galaxy
http://en.wikipedia.org/wiki/Solar_System
ESA - Space Science - How many planets are outside our Solar System?
Since 1995, when Michel Mayor and Didier Queloz of the Observatoire de Geneve, discovered the first planet orbiting another star like the Sun, over two hundred more extrasolar ...
http://www.esa.int/esaSC/SEMZVI5V9ED_index_0.html
How Many Planets are in the Solar System?
Are you wondering how many planets are in the Solar System? Until just a few years ago ... as a subclass of planets, the latest status is that our solar system now has 13 planets ...
http://www.universetoday.com/15568/how-many-planets-are-in-the-solar-sys...
How Many Planets Are in Our Solar System? - Yahoo! Voices - voices ...
Most of us learned in elementary school that nine planets make up our solar system. Yet those old textbooks may be in need of updating and perhaps soon. A big ball farther out ...
http://voices.yahoo.com/article/20746/how-many-planets-our-solar-system-...
Extrasolar planet - Wikipedia, the free encyclopedia
Many exoplanets have orbits with very small semi-major axes, and are thus much closer to their parent star than any planet in our own solar system is to the Sun.
http://en.wikipedia.org/wiki/Extrasolar_planet

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