Difference between revisions 3758801 and 3758803 on simplewiki

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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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Kepler's laws of planetary motion explain how things go around the Sun. An object orbits along an ellipse path. The Sun is at one focus. Objects which are closer to the Sun go more quickly. This is because they are more affected by the Sun's gravity. The distance between a body and the Sun changes over the course of its orbital year. When a body is closest to the Sun, the approach is called the perihelion. (
''ὁ ἥλιος''; Sun. ''περί'' + acc; near, by.) When a body is most distant from the Sun, the point is called the aphelion. (''ὁ ἥλιος''; Sun. ''ἀπό'' + gen; from, away from.) The orbits of the planets are nearly cirles. But many comets, asteroids and Kuiper belt objects go along highly elliptical paths. We can predict where things are in the Solar System  using models of numbers.

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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.