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User:AJona1992/Solar System
[[File:Planets2008.jpg|400px|thumb|right|The [[Sun]], [[planet]]s and [[dwarf planet]]s of the Solar System. Compared with each other, the sizes are correct but the distances are not.]]
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== Sun ==
The Sun is the star of the Solar System. Its large mass (332,900 Earth masses) produces temperatures and densities in its core great enough to keep nuclear fusion going. Nuclear fusion releases enormous amounts of energy. This energy is 
mostly radiated into space as electromagnetic radiation, mostly in the form of visible light.

The Sun is classified as a type G2 yellow dwarf star. But this name is misleading as, compared to most of stars in our galaxy, the Sun is rather large and bright. The Sun is in the prime of its life at the moment. It has not yet exhausted its store of hydrogen for nuclear fusion. The Sun is gradually growing brighter.

The Sun is a population I star. It was born in the later stages of the Universe's evolution. It contains more elements heavier than hydrogen and helium than older population II stars. Elements heavier than hydrogen and helium (such as metals) were formed in the cores of ancient and exploding stars. So the first generation of stars had to die before the universe could be enriched withhave these atoms. The oldest stars contain few metals, while stars born later have more.

== Material to be used ==
In the Solar System often there is a Solar Wind. This is a flow of [[Plasma (physics)|Plasma]]. The Solar System is located in one of the arms of the Milky Way galaxy. The Milky Way galaxy contains about 200 billion (200,000,000,000) stars.

== Trans-Neptunian region ==
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Eris (68 AU) is the largest known scattered disc object. There has been a debate on weather or not it should be described as a planet. This is because it is 25% larger than Pluto and it is around the same distance across. It is the largest known dwarf planet in the Solar System. It has one moon, [[Dysnomia (moon)|Dysnomia]]. Eris and Pluto have a similar orbit.