This article seems to suffer from even more than the usual level of "The author has no clue about the science" Syndrome, especially the bits about gravitational lensing.
Now, I thought that galaxies were so sparse that most of the interactions two "colliding" galaxies would have would be gravitational (rather than an actual collision). In this case, the finding would seem to imply that dark matter isn't affected by gravity the same way, which would be darned weird.
It's true that the stars in colliding galaxies don't actually collide, but they are looking at the collision between two clusters of galaxies. Clusters contain hot, X-ray emitting gas. And gas does collide, whereas the dark matter passes through.
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This article seems to suffer from even more than the usual level of "The author has no clue about the science" Syndrome, especially the bits about gravitational lensing.
Now, I thought that galaxies were so sparse that most of the interactions two "colliding" galaxies would have would be gravitational (rather than an actual collision). In this case, the finding would seem to imply that dark matter isn't affected by gravity the same way, which would be darned weird.
It's true that the stars in colliding galaxies don't actually collide, but they are looking at the collision between two clusters of galaxies. Clusters contain hot, X-ray emitting gas. And gas does collide, whereas the dark matter passes through.