: :I'm not sure I can except dark matter as a feasible explanation to the attractive forces of gravity. So far we cannot see dark matter by any means of detection. It does not effect light as far as we can tell. In fact it doesn't appear to effect anything except gravity. However gravity has already been calculated almost strictly as a function of mass applying to matter that we can already see. In fact all of the natural forces discovered in the universe have a direct relation to visible matter. The attractive/ repelling force of electrons and protons can be predicted by a function that is uncanningly simmilar to the gravitational force equation. Is dark matter also the reason for this phenomenon. If there is more evidence of the existance of such dark matter than I am very interested in hearing about it, but from what I have heard I am not convinced.