GS-9209 (galaxy)

GS-9209 is a massive quiescent galaxy^{[NB 1]} that exists at redshift z=4.658 or 25 billion light years. It has a stellar mass of 3.8×10¹⁰ solar masses (7.6×10⁴⁰ kg; 1.67×10⁴¹ lb) which is roughly 10 times the mass of the Milky Way galaxy.^[1][2]

When the universe was around 800 million years old, the star formation rate (SFR) in the GS-9209 galaxy has undergone a sharp decrease. Most of the stars that exist in this galaxy has formed over a 200 million year period when the universe was 600-800 million years old.^[1]

Notes

1. quiescent galaxy: a galaxy that is no longer forming stars