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The scale of the universe from "summary" of The Magic of Reality by Richard Dawkins
The universe is vast. It stretches out unimaginably far. Light from the most distant galaxies we can see has taken billions of years to reach us. We think of Earth as big, yet it is just a tiny speck in the vastness of space. Our solar system, with its sun and planets, is minuscule compared to the Milky Way galaxy we reside in. And the Milky Way is just one of billions of galaxies in the universe. The sheer scale of the universe is mind-boggling. To get a sense of just how big the universe is, imagine shrinking it down to the size of a football field. On this scale, the sun would be the size of a small grape, Earth the size of a peppercorn, and the distance to the nearest star would be several football fields away. Our entire solar system would fit within the width of a human hair. And if we were to shrink the Milky Way galaxy down to this scale, it would stretch across the United States. This vastness ca...
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