الثلاثاء، 5 يوليو 2011

The solar system


Our solar system consists of an average star we call the sun, with eight planets moving around the sun which they are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. It includes also satellites of the planets which are the moons, Comets, asteroids and meteoroids. I will just focus on the sun and the planets.
The sun is the richest source of electromagnetic energy in the solar system, and mostly we got it from heat and light. The mass of the sun is very huge with 1.98*1030 Kg approximately, with 99.85% of all masses in the entire solar system.
nto two part; inner planets and outer planets. The inner planets are the first four planets starting from the nearest planet from the sun which is Mercury, and it is the smallest planets in the solar system. Venus, earth and mars comes after it. The outer planets are the last four planets starting from Jupiter which is the biggest planets, and Saturn, Uranus and Neptune comes after it.
From 1930 until 2006, Pluto was classified as a planet. But after that, the IAU decided to exclude Pluto from the planets and added as a member of a dwarf planet with other 4 dwarf planets because in some points it crosses the orbit of the neighbor planet.

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·         References:                   1- http://myweb.tiscali.co.uk/ianridpath/Pluto.pdf



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