An international team led by the University of Geneva (UNIGE) has identified three ultra-massive galaxies—nearly as massive as the Milky Way—already in place within the first billion years after the Big Bang.

The JWST’s FRESCO program, developed by the team, systematically analyzed emission-line galaxies from the dawn of the universe. This allowed them to accurately measure the distances and stellar masses of these newly detected giants.

Three ultra-massive galaxies from the early universe, named "red monsters" show star formation happened faster than believed.

The James Webb telescope has spotted three gigantic "red monster" galaxies that were spawned soon after the Big Bang. They're so large they could rewrite the laws of galactic evolution.

An international team that includes the University of Bath has discovered three ultra-massive galaxies (‘Red Monsters’) in the early Universe forming at unexpected speeds, challenging current models of galaxy formation.