Does nibiru really exist? Will it really have any consequences if this planet were to pass by Earth?

Answer

There are as many scientific arguments to argue that Nibiru exists as there are arguments that the Klingons are Star Trek, or the Jedi are Star Wars. It is nothing but an unsubstantiated assumption, on a bed of poorly translated Sumeric clay tablets, and backed by undercooked astronomical pseudo-arguments. In short, suitable for being the first to lose weight in “my science restaurant”, assuming that you have passed the preselections with it.

Incidentally, this question was already answered earlier by Nicki Mennekens (VUB) and I can only fully agree with that answer.