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This figure highlights galaxies discovered by ALMA that are evolving into a galaxy cluster. The outer field is from data taken by the Hershel Space Observatory. The middle image, from a survey by the National Science Foundation’s South Pole Telescope, uncovered the distant galactic source that revealed 14 galaxies.

Research offers front-row seat to a galactic pile-up

Massive galaxy clusters have been found that date to times as early as three billion years after the Big Bang, containing stars that formed...