Each radiated with the power of roughly a trillion Suns when the cosmos was just 5% of its present age. They are the earliest quasars yet observed and belong to a group of 31 ancient quasars newly identified by Euclid. Finding them could help explain how galaxies and supermassive black holes became so large so soon after the Universe began. Fan, K. Jahnke, D. Stern, C. J. Willott, A. J. Barth, H. J. A. Bowler, K. I. Caputi, D. L. Clements, C. M. Gutierrez, H. J.