If “dark matter” couples to gravitation, why don’t we see any evidence of their conglomerates crashing into other celestial bodies?
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Good question. I can’t answer that one.
Well, the universe is so vast, maybe it's like dropping a rock into the ocean a hundred miles out. The splash is immediate and if we're present, we can see it. But it's effects, the ripples, die out long before it reaches our shore............
That's the best I can come up with...