Dark matter isn’t interacting with itself after all

Hints that a galactic collision knocked the invisible mass askew are disproven

Abell 3827

GALACTIC QUARTET  The way invisible dark matter warped the light from distant galaxies, shown here as the swirl of material surrounding four giant galaxies in cluster Abell 3827 (seen in this Hubble Space Telescope photograph), suggested that dark matter can separate from stars when galaxies collide. But new data refute that idea.

Richard Massey/Durham Univ., ESA, NASA

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