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Big bang and expansion of the universe : A Universe Smaller than the Observable

Sal Khan

Abstract

Things in our universe can be unimaginably large and small. In this topic, we'll try to imagine the unimaginable! Source: Khan Academy (www.khanacademy.org), used under the Creative Commons Attribution-NonCommercial-ShareAlike (CC BY-NC-SA) license. All Khan Academy content is available for free at www.khanacademy.org. Khan Academy does not endorse the World Public Library.

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