Galaxy cluster MACS J0152.5-2852 with dark matter map

This is a NASA/ESA Hubble Space Telescope image of the galaxy cluster MACS J0152.5-2852 . Shown in blue on the image is a map of the dark matter found within the cluster. This cluster was part of a study of 72 galaxy cluster collisions which determined that dark matter interacts with other dark matter even less than previously thought.