Dark Matter May Feel a “Dark Force” That the Rest of the Universe Does Not

April 20, 2015 12:46 PM

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Astronomers watching galaxies collide found evidence of nongravitational forces that could suggest dark matter interacts with itself

After decades of studying dark matter scientists have repeatedly found evidence of what it cannot be but very few signs of what it is. That might have just changed. A study of four colliding galaxies for the first time suggests that the dark matter in them may be interacting with itself through some...

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