dark matter 3-D map

the above video is about a 3-D map created last year by an international team of scientists who, using photos taken by the Hubble thingy thing, mapped the dark matter we can see (or rather, not see) in a small square of space, by looking at the way the starlight bends around it.

Yeah, I never really understood how we could tell that the starlight bends. But the map is purty and cool.