It seems that for a long time astronomy and cosmology have been based on observation and then speculation. Those two tasks are both very hard on their own, with the observation costing tons of money to be able to produce effective telescopes and observation methods. Speculation is even harder since your trying to figure out the inner workings of the Universe with only still pictures of it. Just recently computing has been powerful enough to simulate stuff such as galaxies and even superclusters and therefore making astrophysics more experimental. All this time we have been writing simulations with prior existing knowledge of the laws that govern the Universe, but how can we actually better understand physical properties such as that of dark matter with help from the advances in scientific computing?