Is the universe as a whole electricaly neutral, just wondering that when and if matter is created, as much negative matter (in charge) is generated as positivily charged matter?
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ANSWERS: 5
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The law of conservation of charge says that the charge in a system never changes - even if charged particles are created in the system (you have to have one of each). As far as we know it's always been that way and so the universe is precisely electrically neutral.
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I guess... no one really knows. If the big bang, as modern cosmology indicates, was entirely photonic in nature after the event, (e.g. electrically neutral), then yes - it would probably be electrically neutral afterwards. That said. Some conservation laws can be violated - e.g. the conservation of flavour, in the weak interaction. So, you never know.
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The exact charge is not known. Elegance would suggest that it is neutral, but that is not provable. However, any net charge must be very, very small indeed. That is because the electromagnetic force is many orders of magnitude greater than the gravitational field. Even a small residual net charge would exert a repulsive force greater than that of gravity, and prevent stars and galaxies forming. So we know that the net charge, while not necessarily exactly zero, must be absolutely minute.
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"The universe appears to have no net electric charge, and therefore gravity appears to be the dominant interaction on cosmological length scales. The universe appears to have no net momentum and angular momentum. The absence of net charge and momentum would follow from accepted physical laws (Gauss's law and the non-divergence of the stress-energy-momentum pseudotensor, respectively), if the universe were finite." Source and further information: http://en.wikipedia.org/wiki/Universe
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If there were, say, extra electrons, they'd repel each other and leave toward the outer surface of the universe
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