Galaxy. It is a group of stars held together by gravity. Galaxies are of four types- spiral , barrad spiral, elliptical and irregular . Some galaxies emits millions times more radio pulse tha thers. They are called radio galaxies. Trillion stars. An average galaxy has about 100 billions stars. Milky way is a spiral galaxy about `10,000` light years in diameter with about 100 billion stars. Sun occurs in one of the spiral arms of milky way, about `25,000` light years from centre.\
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