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The solar system consists of the Sun the nine planets 67 satellites of the planets and a large number of small bodies comets and asteroids The inner solar system contains the Sun Mercury Venus Earth and Mars The planets of the outer solar system are Jupiter Saturn Uranus Neptune and Pluto The orbits of the planets are ellipses with the Sun at one focus though all except Mercury and Pluto are very nearly circular The orbits of the planets are all more or less in the same plane called the ecliptic and defined by the plane of the Earths orbit The ecliptic is inclined only 7 degrees from the plane of the Suns equator Plutos orbit deviates the most from the plane of the ecliptic with an inclination of 17 degrees Below you see a diagram that show some relative information about most of the objects in our Solar SystemDiameter kmMoonsSurface tempSurface gravityAxial inclinationAxial rotationThe Sun1 390 000-5800c--25 - 36 daysMercury4 878None350c -170c038058 daysVenus12 104None480c09178243 daysThe Earth12 756120c123423h 56mMars6 787None-23c0382424h 37mJupiterNA16-150c264319h 50mSaturn199 30018-180c1226710h 39mUranus51 80015-210c129817h 10mNeptune49 5008-220c1229518h 24mThe Moon3 474-107c -153c0171527 daysThe sun is the most important part of our solar system It is the biggest object and does have about 98 of the whole mass of the solar system About 13 billion earths would fit inside the sun The sun travels around the galaxy together with planets and other objects bound to it by gravitational forces The largest of the bodies we call planets most of which are in turn are orbited by smaller moons or satellites These objects together with many lesser masses are known as the Solar system The Sun is just a star one of a hundred billion inhabiting
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