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How big is the Universe?

What is Universe, and how big is it? Is there edge of Universe, or center? The Universe is commonly defined as the totality of existence, including planets, stars, galaxies, the contents of intergalactic space, and all matter and energy.The broadest definition of universe is that it is simply everything, while a narrower definition is that the universe is limited to what can be observed. Simila
 
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