The Universe is all of space and time and their contents, including planetes, stars, galaxies and all other forms of matter and energy. While the spatial size of the entire Universe is unknown, it is possible to measure the size of the observable universe, which is currently estimated to be 93 billion light years in diameter. In various multiverse hypotheses, a universe is one of many casually disconnectedconstituent parts of a larger multiverse which itself comprises all of space and time and its contents.
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