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(Phys.org) —Despite the large distances between them, galaxies rarely exist in isolation. They are mostly found in large assemblies known as groups and clusters. Groups are the smallest gatherings, ...

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's another step on the road to one day discovering what dark matter could be. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works.