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What is the total momentum of the whole Universe in reference to the point in space where the Big Bang took place?

According to my reasoning (and a bit elementary knowledge) it should be exactly equal to 0 since the 'explosion' and scattering of the matter throught the space would not change the total momentum in any way.

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There is no point in space where the big bang took place. It happened everywhere, simultaneously. Centered on Earth, since everything is moving away from us with a uniform velocity (or is stationary with respect to the CMB, if you prefer), the net momentum of the universe is approximately zero.

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But you should be cautious about thinking of the big bang as an 'explosion' –  Jerry Schirmer Sep 21 '12 at 18:14
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