A massive clump of dark matter in the Perseus galaxy cluster is linked to its core by a bridge of dark matter, evidence of a history of mergers.

Astronomers discover dark matter 'bridge' linking colliding galaxies: 'This is the missing piece we've been looking for.'

Source: space
Source Link: https://www.space.com/the-universe/astronomers-discover-dark-matter-bridge-linking-colliding-galaxies-this-is-the-missing-piece-weve-been-looking-for