Astronomers have made an intriguing discovery using the James Webb Space Telescope (JWST). They have identified a new galaxy, named JWST-ER1, that is massive and compact. This type of galaxy, known as a massive quiescent galaxy, could shed light on the process of galaxy evolution. One unique feature of JWST-ER1 is the presence of an Einstein ring, which is caused by gravitational lensing. The galaxy is almost perfectly round and shows no signs of star formation or irregularities. Further observations are needed to determine if nearby galaxies contribute to its mass and if it is the central galaxy of a cluster.
https://phys.org/news/2023-09-jwst-massive-compact-quiescent-galaxy.html