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The solar system is the sun and all the objects in orbit around the sun.<ref>Freedman, Kaufmann: ''Universe'', 7th edition</ref> Objects orbiting the sun include planets, moons, asteroids, and comets.
==Planets==
A planet is defined as an object that orbits the [[sun]], is massive enough that its own gravity pulls it into a nearly round shape, and is dominant enough to clear away objects in its neighborhood. <ref>http://www.nasa.gov/vision/universe/solarsystem/planetsf-20060824.html</ref> There are 8 planets in the solar system. They are, in order of increasing distance from the sun:<ref>The third grade</ref>
*[[Mercury]]
*[[Venus]]
*[[Earth]]
*[[Mars]]
*[[Jupiter]]
*[[Saturn]]
*[[Uranus]]
*[[Neptune]]
==Dwarf Planets==
A dwarf planet is an object that orbits the sun and has a round shape. <ref>http://www.nasa.gov/vision/universe/solarsystem/planetsf-20060824.html</ref> The crucial difference between a planet and a dwarf planet is that a dwarf planet is not large enough to clear the neighborhood of its orbit. The only dwarf planet in the solar system is [[Pluto]]
==Asteroids==
There are two asteroid belts in the solar system, the one between the orbits of Mars and Jupiter, and the [[Kuiper belt]], which is in Pluto's orbit around the sun.
==References==
<references/>
[[Category:Astronomy]]
==Planets==
A planet is defined as an object that orbits the [[sun]], is massive enough that its own gravity pulls it into a nearly round shape, and is dominant enough to clear away objects in its neighborhood. <ref>http://www.nasa.gov/vision/universe/solarsystem/planetsf-20060824.html</ref> There are 8 planets in the solar system. They are, in order of increasing distance from the sun:<ref>The third grade</ref>
*[[Mercury]]
*[[Venus]]
*[[Earth]]
*[[Mars]]
*[[Jupiter]]
*[[Saturn]]
*[[Uranus]]
*[[Neptune]]
==Dwarf Planets==
A dwarf planet is an object that orbits the sun and has a round shape. <ref>http://www.nasa.gov/vision/universe/solarsystem/planetsf-20060824.html</ref> The crucial difference between a planet and a dwarf planet is that a dwarf planet is not large enough to clear the neighborhood of its orbit. The only dwarf planet in the solar system is [[Pluto]]
==Asteroids==
There are two asteroid belts in the solar system, the one between the orbits of Mars and Jupiter, and the [[Kuiper belt]], which is in Pluto's orbit around the sun.
==References==
<references/>
[[Category:Astronomy]]