Keck Observatory

An artist's impression showing what happened when two giant galaxy clusters, known together as MACS J0018.5, collided: the dark matter in the galaxy clusters (blue) moved ahead of the associated clouds of hot gas, or normal matter (orange). Both dark matter and normal matter feel gravity, but only normal matter experiences additional effects such as shocks and eddies that slow it down during a collision. Credit: WM Keck Observatory / Adam Macarenko

Dark matter overtakes normal matter in the collision of giant galaxy clusters

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Astronomers have managed to unravel a complicated collision between two giant galaxy clusters in which the clusters' vast dark matter clouds separated from the normal matter. Each of the clusters contains thousands of galaxies and is located billions of miles apart
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