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Cosmic inflation theory explains the rapid expansion of the early universe from "summary" of The Science of Interstellar by Kip Thorne
Cosmic inflation theory postulates that the universe underwent a rapid expansion in its early stages. This expansion occurred within a fraction of a second after the Big Bang, causing the universe to grow exponentially in size. The theory suggests that this rapid expansion was driven by a mysterious force field that is different from anything observed in the universe today. The concept of cosmic inflation helps to address several key questions about the early universe. One of the main puzzles it solves is why the universe appears to be so uniform and isotropic on large scales. Without inflation, it would be difficult to explain how different regions of the universe could have reached the same temperature and density, given that they are too far apart for light to have traveled between them in the time since the Big Bang. In addi...
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