Beautiful map (well, model) of dark matter based on intense mapping and statistical models to take into account gravitational lensing.
What this basically shows (well, predicts) is that “galaxies don’t have borders”. In the words of far-cleverer-than-most Phil Plait:

…since the dark matters extends so far past the limits of what we see, galaxies really don’t have borders. They just thin out over huge distances of space, overlapping. I picture it a bit like a mountain range: there are local peaks, but at their bases all the mountains merge together so it’s hard to tell where one ends and another begins.

Amazing.

Beautiful map (well, model) of dark matter based on intense mapping and statistical models to take into account gravitational lensing.

What this basically shows (well, predicts) is that “galaxies don’t have borders”. In the words of far-cleverer-than-most Phil Plait:

…since the dark matters extends so far past the limits of what we see, galaxies really don’t have borders. They just thin out over huge distances of space, overlapping. I picture it a bit like a mountain range: there are local peaks, but at their bases all the mountains merge together so it’s hard to tell where one ends and another begins.

Amazing.

(Source: )