The Milky Way Galaxy, the galaxy that contains our Solar System, is 100,000 light years (light year=186,000 miles a second) in diameter. The Milky Way contains over 100 billion planets and 300 billion stars. The Milky Way Galaxy is dwarfed by most galaxies, including M87, an elliptical galaxy 980,000 light years in diameter and Hercules, which is 1.5 million light year across. The Milky Way Galaxy houses our planet Earth (7,926 miles in diamete...r) is a single galaxy in a universe containing 100 billion galaxies with 100 billion stars in each galaxy.
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