How do we "see" Dark Matter? (teaser)

I’ve picked my topic for this week’s “Ask a Physicist” as suggested by io9’s own Charlie Jane. She asks:

I’m curious about galaxies with dark matter cores, and how we can “see” dark matter.

As it happens, I work on gravitational lensing (and have done a fair amount on A1689), so prepare yourself this Thursday or Friday for lensing fun. Also, if you have lensing related sub-questions, be sure to send them to me, or just comment below.


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