Astronomers Reveal Hidden Activity in the Early Universe’s Most Massive Galaxies
An international team of astronomers has studied ultramassive galaxies - galaxies containing more than 100 billion stars - as they existed when the universe was less than 2 billion years old. The results show that while some of these ultramassive galaxies, or UMGs, had already shut down star formation and become extremely dust-poor, others exhibit ongoing or residual activity that is obscured by dust, revealing multiple evolutionary pathways for the most massive galaxies.



