Parallel universes may exist from "summary" of A Breif History of Time and the Universe in a Nutshell by Stephen Hawking
The idea that parallel universes may exist is a mind-boggling concept that challenges our conventional understanding of the cosmos. According to some theories in quantum mechanics and cosmology, there could be multiple universes existing alongside our own, each with its own set of physical laws and constants. These parallel universes, also known as multiverses, could potentially be vast in number and vastly different from our own universe. In some multiverse theories, each universe could be like a bubble or a membrane floating in a higher-dimensional space, completely separate and distinct from one another. One of the most famous multiverse theories is the Many-Worlds Interpretation of quantum mechanics, proposed by physicist Hugh Everett in the 1950s. According to this theory, every time a quantum event occurs, the universe splits into multiple branches, each representing a different outcome. This would mean that there are countless parallel universes, each containing a different version of reality. The existence of parallel universes is not just a fantastical idea dreamed up by science fiction writers. Some scientific theories, such as string theory and inflationary cosmology, suggest that the universe we observe is just one of many possible universes that make up the multiverse. While the concept of parallel universes may seem far-fetched and impossible to prove using current technology, it provides a fascinating glimpse into the mysterious and complex nature of the cosmos. As we continue to unravel the secrets of the universe, the idea of parallel universes may become more than just a theoretical possibility—it could be a fundamental aspect of reality that we have yet to fully grasp.
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