The quiescent galaxies aren't dead, and there's ample evidence that the galaxies experienced bouts of star formation before going quiet. "Almost half of early massive galaxies are interacting with other nearby galaxies, suggesting this isn’t a quirk but a widespread cosmic phenomenon," she said. "If many early galaxies collide and experience rapid growth, then it may not be surprising that we see so many dead galaxies in the early Universe." The discovery also underscores the importance of reevaluating simulations that previously underestimated the diversity and complexity of early galaxies. For More InformationGalaxy-killing Wind Discovered in the Early UniverseMultiphase Images of a Powerful Supernova-Driven Wind in the Early Universe