One light year is about 9.5 x 10^15 meters. The disk of the milk way galaxy(a disk is a flattened, circular region of stars and dust) is about 100,000 light years in diameter and 1,000 lightyears thick.
The Milky Way galaxy is 100,000 light years across and 1000 light years thick. This seems pretty massive until you compare the Milky Way’s size to the rest of the universe. Consider this: if you were to make a scale model using a penny for the Milky Way, then the visible (using the Hubble Space Telescope) universe’s horizon would be 15-20 miles away from that penny.
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