"Ghostly Einstein Ring Unveils Dark Matter Interaction Mystery"

A dense and compact galaxy, JWST-ER1, observed by the James Webb Space Telescope suggests that dark matter interacts with itself. The galaxy, located 17 billion light-years away, forms a perfect "Einstein ring," providing physicists with a valuable probe for measuring the mass enclosed within the ring's radius. Analysis indicates that dark matter explains only about half of the galaxy's mass, leading to the suggestion that its unusually high density could be due to a higher population of stars or self-interacting dark matter particles. This discovery could provide insights into the nature of dark matter and its behavior, with the hope that the James Webb Space Telescope will reveal more about this mysterious substance.