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FWIW, I don't think that gravitational lensing plays an important role in this analysis. There's a lot of matter in these streams, but it's not as concentrated--by many orders of magnitude--as it is in a galaxy. What it lacks in density it makes up for in volume, however.

What practicle applications can be brought out of this inside a galaxy. How does the gravity affect light and speed dissolution (?sp) while travelling along it? Do they connect most stars or are they simply just randomly strung out through out the galaxy between pockets of dark matter? By the way, if a ship was (for arguments sake) travelling at the speed of light...or somehow faster...and went through a pocket of dark matter, would it be destroyed? Mass on mass? or would it be a matter of the vehicle turning to pure energy and passing through it? Just wondering.