Galaxies move away from each other from "summary" of A Breif History of Time and the Universe in a Nutshell by Stephen Hawking
As we look out into the vast expanse of the universe, we can observe a curious phenomenon - galaxies seem to be moving away from each other. This observation, known as the expansion of the universe, has profound implications for our understanding of the cosmos. The concept of galaxies moving away from each other is not just a random occurrence, but rather a fundamental property of the universe itself. It is a consequence of the Big Bang, the event that marked the beginning of our universe. In the moments following the Big Bang, the universe was incredibly hot and dense, and as it expanded, it also cooled down. As the universe expanded and cooled, matter began to clump together under the influence of gravity, eventually forming galaxies. However, the expansion of the universe did...
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