Early galaxy collisions may explain why giant galaxies died young
A new study suggests that some of the Universe’s earliest giant galaxies may have lived dramatic lives. They began as dusty stellar factories, producing hundreds of stars each year, before suddenly shutting down and becoming cosmic graveyards. The research offers a possible explanation for one of astronomy’s most persistent puzzles: how massive galaxies formed so quickly after the Big Bang and then stopped making stars while the Universe was still young. The study was conducted by researchers at the Institute of Astronomy, Geophysics, and Atmospheric Sciences at the University of São Paulo (IAG-USP) in Brazil and international collaborators. The work links two seemingly different classes of galaxies in the early Universe and proposes a common evolutionary path between them. A Mystery From the Dawn of Cosmic History Astronomers have long been puzzled by the existence of massive quiescent galaxies, often called MQs. These systems contain enormous numbers of stars yet show little or no ongoing star formation. Even more surprising, they appeared when the Universe was only 3 to 4 billion years old. The timing …
