Here is the Dark Matter map they made. How do they know the gravitational pull they measured to make this map was from Dark Matter and not from the stars and galaxies that are seen? They are saying the Dark Matter attracts "ordinary" matter through its gravitational pull. Why not the other way around? Or why assume Dark Matter at all, why couldn't they have just been measuring the gravitational pull of the "ordinary" matter? I don't know, I'm just wondering. I would like to learn a lot more about this.
Her are a couple of related links:
Dark Matter Mapped
Hubble makes 3D dark matter map
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