This artist’s impression depicts the formation of a galaxy cluster in the early Universe. The galaxies are vigorously forming new stars and interacting with each other. Such a scene closely resembles the Spiderweb Galaxy (formally known as MRC 1138-262) and its surroundings, which is one of the best-studied protoclusters.
Illustration credit: ESO/M. Kornmesser
Note: For more information, see Construction Secrets of a Galactic Metropolis.