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A comment on A Physicist Who Denies Dark Matter. Parent comment

Re:A Physicist Who Denies Dark Matter by mark-r on Saturday May 20, 2017 @10:20PM (#14385382)
How does this dark matter have enough gravitational effect to change the structure of the universe, yet not clump together? It doesn't make sense.
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Re:A Physicist Who Denies Dark Matter by michaelcampbell on Sunday May 21, 2017 @11:18AM (#14387662)
Unless it doesn't exhibit gravitational properties with itself?

Just a thought; I have no training or experience here.

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