"JWST Unveils Enigmatic Quiescent Galaxy: Massive and Compact"

Astronomers using the James Webb Space Telescope (JWST) have discovered a massive and compact quiescent galaxy, designated JWST-ER1, as part of the ongoing COSMOS-Web survey. The galaxy exhibits a complete Einstein ring, a phenomenon caused by gravitational lensing. JWST-ER1 has a redshift of 1.94, a radius of approximately 21,500 light years, and an estimated mass of 650 billion solar masses. The galaxy is almost perfectly round and shows no obvious signs of star formation or irregularities. Further observations are needed to investigate its mass and determine if it is the central galaxy of a cluster progenitor.