I don't buy Dark Matter/Energy. IF your empirical evidence contradicts your mathematical theory then you rework the theory to fit the evidence. Instead they have invented matter and energy to account for the discrepancy. to my knowledge the only evidence for dark matter and Dark Energy is that the predicted result doesn't match the observed result. that just means the equations we have created to model the properties of Gravity are missing a term. No model will ever be 100% perfect and the more correct the the model the more extreme the measurement needed to notice the discrepancy. So until somebody has some is a jar I see no reason to believe in dark matter/energy. I think this is off topic but I just wanted to give my 2 cents.