We found a galaxy from 8 billion years ago that looks just like ours, which totally ruins our theory on how galaxies were built back then.
April 3, 2026
Original Paper
Milky-Way-like stars in a galaxy core 8 billion years ago revealed by gravitational lensing
arXiv · 2604.01828
The Takeaway
Astronomers thought massive, old galaxies were mostly packed with tiny 'dwarf' stars. By using a cosmic magnifying glass, they found a distant galaxy with a mix of stars just like ours, suggesting galaxies haven't changed as much as we thought over billions of years.
From the abstract
The assembly of stellar-dominated cores in elliptical galaxies is key to understanding how cosmic structures evolved. Gravitational lensing offers unique insights into the nature of their stars. We report the discovery of the smallest known quadruply lensed quasar (radius ~0.2"), whose lensing galaxy at redshift 1.055 (5.5 billion years after the Big Bang) features a lensing mass of only ~2x10^10 M_sun. A Bayesian analysis, based on the system's exceptional properties and standard scaling relati