The James Webb Space Telescope spotted galaxy M1149-BSG-z5 at redshift 5.1 — with clear spiral arms, a massive bar, and an active nucleus. With a stellar mass of 10^10.45 M☉, it churns out 144 stars per year and has already accumulated half the Sun's metallicity. In the company of a neighbor and in
arXiv:2606.25022 · 2026-06-23