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Where the Planets Are In the beginning the Earth was believed to be both flat and at the center of the universe Then a sailor set sail to prove that the Earth is in fact round Decades later science proved that the churches were wrong and in fact the Earth orbited around the Sun not the other way around Now it is commonly known that the solar system that the human race lives in is just a small part of a much larger spinning body called a galaxy Now science argues about whether or not Pluto is really a planet and how the solar system itself was originally formed Current studies of the solar system show that not only due planets clean extra material out of a solar system but they are also capable of changing their orbits When a star is born the surrounding material that is left is called planetary protomaterial This material is made up of layers of gases ice crystals and other solid matter The larger pieces start pulling in the smaller ones by using gravitational pulls and time Over time these larger pieces start to clear out a path around the star that they orbit Following current thinking the reason that the largest of the planets are on the outer portion of the solar system is that is where the most material will be at the time that the planet formed As the loose material gets added together to form planets the material that is just outside of the gravity well of the growing planet gets pulled at just like everything else except that the pull is only enough to send it flying out of the orbital disk In this manner planets clean out the solar system of all unused material that would otherwise clutter up the space between other planets Sometimes the protomaterial can act just like
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