Galaxy is a collection of many stars dust and gas held together by gravity. There are billions of galaxies scattered throughout the universe. They range in size from diameter of a few thousands of half a million light years.
The galaxy of which our earth is a part is called Milky-Way. Our sun is just one of the hundreds of billions of stars contained in it. A portion of the Milky-Way Galaxy can be seen in the sky with the naked eye. In common language this visible part on Milky-Way is also called the Milky-Way.
The Milky-Way shaped like a thin disk with a bulge in the center. Its diameter is about 100,000 light years, and is about 10,000 light-years thick at the center. Stars, dust and gases fan out from the central bulge like long curving arms that form a spiral. Because of this kind of of shape, Milky-Way is classifies as a spiral galaxy. Our solar system is located towards the outer periphery of this galaxy
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