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What a cluster: When dark matter collides, things get weird
What a cluster: When dark matter collides, things get weird

Dark matter just got a shade more mysterious. Scientists studying a smashup between giant clusters of galaxies have watched how each cluster’s dark matter passes through the collision – and found that it seems to contradict certain theories of how dark matter behaves. The findings, published in the journal Science, show that further study of  these dramatic collisions could shed light on a very dimly understood part of the cosmos. But for the moment, they leave wide open the question of what dark matter is. Dark matter can’t be touched or seen, but it makes up 84.1% of all the matter in the universe. That means that for every one share of normal matter –...

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