How big is the Universe?

The biologist J.B.S Haldene once observed “The Universe is not only queerer than we suppose; it is queerer than we can suppose”. Carl Sagan estimated the probable number of planets in the universe at large to be 10 billion trillion and he further says “If we are randomly inserted into the universe, the chances that you would be on or near a planet would be less than one in a billion trillion trillion”.

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http://www.wonderwhizkids.com/index.php/our-universe



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