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They don't.There is no certainty that the universe is finite or infinite, and indeed it may be impossible to tell. The edge of the observable universe is around 46 billion lightyears away; beyond that, it might end after a metre or it might truly go on forever.

Answer2:

Scintists as a community don't know. The Universe is finite with a radius around 158 Tera tera meters or 16 Billion light years away. The Universe is finite and has finite power P=3645E49 watts.

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14y ago

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