ABOUT UNIVERSE
The universe is all of space and time[a] and their contents,[10] including planets,stars, galaxies, and all other forms of matter and energy. While the spatial size of the entire universe is unknown,[3] it is possible to measure the size of theobservable universe, which is currently estimated to be 93 billionlight-years in diameter. In various multiverse hypotheses, a universeis one of many causallydisconnected[11] constituent parts of a larger multiverse, which itself comprises all of space and time and its contents;[12] as a consequence, ‘the universe’ and ‘the multiverse’ are synonymous in such theories.
Universe
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