Dark Matter Exists | Cosmic Variance

Dark Matter Exists | Cosmic Variance

Pretty good explanation of the whole "dark matter" thing that has been in the news lately. I was wondering how they "proved" that dark matter exists. One thing to remember is that this analysis is based on the assumption that all of the Einstein-ish stuff is correct and his assumptions are valid.

It is interesting to consider that any manipulations to the data assume a certain model of the universe. What if we used a different model?