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Originally Posted by xelasnave
What I dont understand is if dark matter plays such an important role in the gravity makeup of "everything" how is it that in the photo the "dark matter" is not subject to the gravity here (I gather that is the point???). It would seem to me that the fact that this stuff is not caught up in a gavity dance it lacks the stuff that can cause a gravitational effect which seems to me to be the main requirement for dark matter.
alex.
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no the point is, it's *only* subject to gravity. As I understand it, the ordinary matter shooting out from the collision hits the intergalactic medium and slows down suddenly (hence the shock front). The dark matter doesn't interact with the IGM, and goes sailing on gradually being slowed by gravity alone. End result - the dark matter travels further from the collision.