Planetas Planets Planeten Pianeti
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Uploaded by jordijordi4 on Feb 5, 2009
Planets are generally divided into two main types: large, low-density gas giants, and smaller, rocky terrestrials. Under IAU definitions, there are eight planets in the Solar System. In order from the Sun, they are the four terrestrials, Mercury, Venus, Earth, and Mars, then the four gas giants, Jupiter, Saturn, Uranus, and Neptune. Many of these planets are orbited by one or more moons, which can be larger than small planets. As of February 2009, there are 337 known extrasolar planets, ranging from the size of gas giants to that of terrestrial planets. This brings the total number of identified planets to at least 345. The Solar System also contains at least five dwarf planets: Ceres, Pluto (formerly considered to be the Solar System's ninth planet), Makemake, Haumea and Eris. No extrasolar dwarf planets have yet been detected.
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