Scientists have recently detected a planet (COROT-Exo_7b) with about 2x the Earths radius orbiting a star 400 LY away. If Planet X was going to hit or disrupt Earth in 2012 even if it was travelling at the speed of light could be no further then 3.5 light years away. Anyone who is capable of rational thought would soon work out we would have seen it by now. The evidence does not support it's existence.
Mark
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