My vague understanding of this article is that what's being described is more like the bright "caustics" that you see when light shines through a glass of water

My vague understanding of this article is that what's being described is more like the bright "caustics" that you see when light shines through a glass of water (https://en.wikipedia.org/wiki/Caustic_%28optics%29 https://en.wikipedia.org/wiki/Caustic_%28optics%29). The notion is that a massive object like the Earth would act something like a lens, gravitationally. That isn't usually apparent, because most types of matter and energy would simply be absorbed when they hit the Earth. But dark matter (according to our best guesses today) can pass straight through the Earth just like light through a transparent object. So if there really are "streams" of dark matter all moving the same direction passing through us, they would act analogously to light rays through an ordinary lens. (And since there could be multiple streams going different directions, it could wind up looking like several light sources shining through that glass of water, with these "hairs" or focal points extending out in several directions.) The two questions that come to my mind after reading this brief article are, 1) does the same thing happen with, say, solar neutrinos? (Maybe they're just too fast for the effect to be meaningful?) And 2) if they're going to talk about how much more Jupiter does this focusing than the Earth does, is there a reason they didn't go all the way and talk about potentially even stronger "hairs" created by the Sun itself? (Maybe those wind up focusing inside the star?)