Our universe might be truly, extremely large - but finite from the standards and units of Cosmos. Or it might be infinitely large and cannot be measured, extending infinitely in all directions. Either of these explanations however do not in any way make it easier to understand the properties of universe.
Imagining a single universe is complicated enough and to explain it using the law of physics increases the degree of difficulty. Moreover, the fact of existences of more than universe may baffle us completely. But breaking the Cosmos in parallel universes makes it possible for scientists to understand many perplexities.
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