The Big Bang theory explains the origin and evolution of the universe from "summary" of The World of Physics 2nd Edition by John Avison
The Big Bang theory offers an explanation for the origin and evolution of the universe. According to this theory, the universe began as a singularity, a point of infinite density and temperature, approximately 13.8 billion years ago. At this moment, all matter and energy were concentrated in this single point. As the singularity expanded, it cooled and began to form the basic building blocks of matter, such as protons, neutrons, and electrons. These particles eventually combined to form atoms, which in turn clumped together to create stars and galaxies. Over billions of years, these galaxies continued to move away from each other as the universe expanded. The discovery of the cosmic microwave background radiation provided strong evidence in support of the Big Bang theory. This faint glow is the remnant of the intense heat that was present in the early universe, and its uniformity across the sky suggests a common origin. The expansion of the universe is another key piece of evidence for the Big Bang theory. Astronomers have observed that galaxies are moving away from each other at ever-increasing speeds, indicating that the universe is still expanding. While the Big Bang theory has been successful in explaining many aspects of the universe's origin and evolution, there are still unanswered questions. For example, the theory does not address what triggered the initial singularity or what existed before the Big Bang. Scientists continue to study the cosmos in the hopes of uncovering more clues about the nature of our universe.
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