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What is Dark Matter?

The true answer is: no one knows. But we know what it is not and all the properties it must have. These are explained in the dark matter page.

Why are there only three dimensions? How can we be sure there are no more than three?

We actually don’t know if there are only three spatial dimensions. The idea of possible extra dimensions has been around for a while. Many physicists take this very seriously; for example the so-called “string theories” usually predict 9-10 spatial dimensions. Experimentalists are looking for possible evidence of new dimensions, without any luck so far. Read more

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